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A flying disc has a radially symmetric form having an upper surface and a lower surface. The upper surface includes a raised central portion, a flat annular ring encompassing the raised central portion, and a raised rim extending above and encompassing the flat annular ring. A maximum height of the

A flying disc has a radially symmetric form having an upper surface and a lower surface. The upper surface includes a raised central portion, a flat annular ring encompassing the raised central portion, and a raised rim extending above and encompassing the flat annular ring. A maximum height of the central raised portion above the flat annular ring is no greater than a height of the raised rim.

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What is claimed is: 1. A flying disc, comprising: a radially symmetric form suitable for rotational flight when thrown by a human, said radially symmetric form having an upper surface and a lower surface; the upper surface including a raised central portion, a flat annular ring encompassing the rai

What is claimed is: 1. A flying disc, comprising: a radially symmetric form suitable for rotational flight when thrown by a human, said radially symmetric form having an upper surface and a lower surface; the upper surface including a raised central portion, a flat annular ring encompassing the raised central portion, and a raised rim extending above and encompassing the flat annular ring, wherein said raised central portion comprises a raised central dome that curves along a maximum diameter of the flying disc; wherein a maximum height above said flat annular ring of all portions of the flying disc encompassed by the flat annular ring is no greater than a height of the raised rim; and wherein the raised rim includes a rim top, and wherein a first thickness of the flying disc measured orthogonally to the rim top is greater than a second thickness of the flying disc measured orthogonally to the flat annular ring. 2. The flying disc of claim 1, wherein the flying disc weighs approximately 100 g. 3. The flying disc of claim 1, wherein an overall height of the flying disc is between 10% and 15% of an overall diameter of the flying disc. 4. The flying disc of claim 1, wherein the flying disc has an overall diameter of approximately 9 inches. 5. The flying disc of claim 1, wherein raised rim includes a rim top and a sloped inner sidewall extending substantially between said flat annular ring and said rim top, wherein the sloped inner sidewall has a flat profile over substantially its entire extent. 6. A flying disc, comprising: a radially symmetric form suitable for rotational flight when thrown by a human, said radially symmetric form having an upper surface and a lower surface; the upper surface including a raised central portion, a flat annular ring encompassing the raised central portion, and a raised rim extending above and encompassing the flat annular ring; wherein a maximum height above said flat annular ring of all portions of the flying disc encompassed by the flat annular ring is no greater than a height of the raised rim; wherein said raised rim includes: a sloped inner sidewall having a flat profile, said sloped inner sidewall having a greatest height at its outermost extent; a sloped outer sidewall having a flat profile, said sloped outer sidewall having a greatest height at its innermost extent; and a rim top intermediate said sloped inner sidewall and said sloped outer sidewall, said rim top having a flat profile; wherein said sloped inner sidewall extends substantially between said flat annular ring and said rim top and has said flat profile over substantially its entire extent; and wherein a first thickness of the flying disc measured orthogonally to the rim top is greater than a second thickness of the flying disc measured orthogonally to the flat annular ring. 7. The flying disc of claim 6, wherein the flying disc weighs approximately 100 g. 8. The flying disc of claim 6, wherein an overall height of the flying disc is between 10% and 15% of an overall diameter of the flying disc. 9. The flying disc of claim 6, wherein the flying disc has an overall diameter of approximately 9 inches. 10. A flying disc, comprising: a radially symmetric form suitable for rotational flight when thrown by a human, said radially symmetric form having an upper surface and a lower surface; the upper surface including a raised central portion, a first flat annular ring encompassing the raised central portion, and a raised rim extending above and encompassing the flat annular ring; wherein a maximum height above said first flat annular ring of all portions of the flying disc encompassed by the first flat annular ring is no greater than a height of the raised rim; wherein the lower surface includes: a central generally concave portion; a second flat annular ring corresponding to a location of said first flat annular ring on the upper surface and encompassing the central generally concave portion; an annular fillet curve encompassing the second flat annular ring of the lower surface; and a rim foot encompassing said annular fillet curve, wherein the annular fillet curve extends substantially between the second flat annular ring and the rim foot; and wherein the raised rim includes a rim top, and wherein a first thickness of the flying disc measured orthogonally to the rim top is greater than a second thickness of the flying disc measured orthogonally to the first flat annular ring. 11. The flying disc of claim 10, wherein the flying disc weighs approximately 100 g. 12. The flying disc of claim 10, wherein an overall height of the flying disc is between 10% and 15% of an overall diameter of the flying disc. 13. The flying disc of claim 10, wherein the flying disc has an overall diameter of approximately 9 inches. 14. The flying disc of claim 10, wherein raised rim includes a rim top and a sloped inner sidewall extending substantially between said flat annular ring and said rim top, wherein the sloped inner sidewall has a flat profile over substantially its entire extent. 15. A flying disc, comprising: a radially symmetric form suitable for rotational flight when thrown by a human, said radially symmetric form having an upper surface and a lower surface; the upper surface including a raised central portion, a lower intermediate surface, and a raised rim extending above and encompassing the lower intermediate surface, wherein said raised rim includes: a sloped inner sidewall having a flat profile, said sloped inner sidewall having a greatest height at its outermost extent; a sloped outer sidewall having a flat profile, said sloped outer sidewall having a greatest height at its innermost extent; a rim top intermediate said sloped inner sidewall and said sloped outer sidewall, said rim top having a flat profile; wherein a maximum height of all portions of the flying disc is no greater than a height of the raised rim and said sloped inner sidewall extends substantially between said lower intermediate surface and said rim top and has said flat profile over substantially its entire extent; and wherein a first thickness of the flying disc measured orthogonally to the rim top is greater than a second thickness of the flying disc measured orthogonally to the lower intermediate surface. 16. The flying disc of claim 15, wherein said raised central portion comprises a raised central dome that curves along a maximum diameter of the flying disc. 17. The flying disc of claim 15, wherein said form comprises a unitary piece of foam. 18. The flying disc of claim 15, wherein said lower intermediate surface comprises a flat annular ring. 19. The flying disc of claim 18, wherein the flat annular ring lies in a plane orthogonal to a central axis about which the flying disc is radially symmetric. 20. The flying disc of claim 15, wherein the lower surface includes: a central generally concave portion; a flat annular ring corresponding to a location of said lower intermediate surface on the upper surface and encompassing the central generally concave portion; an annular fillet curve encompassing the flat annular ring of the lower surface; and a rim foot encompassing said fillet curve, wherein the annular fillet curve extends substantially between the flat annular ring and the rim foot. 21. The flying disc of claim 15, wherein an overall height of the flying disc is between 10% and 15% of an overall diameter of the flying disc. 22. The flying disc of claim 15, wherein the flying disc weighs approximately 100 g. 23. The flying disc of claim 15, wherein the flying disc has an overall diameter of approximately 9 inches. 24. A flying disc, comprising: a radially symmetric form suitable for rotational flight when thrown by a human, said radially symmetric form having an upper surface and a lower surface; the upper surface including a raised central portion, a lower intermediate surface encompassing the raised central portion, and a raised rim extending above and encompassing the lower intermediate surface, wherein a maximum height of all portions of the flying disc encompassed by the lower intermediate surface is no greater than a height of the raised rim; the lower surface including: a central generally concave portion; a flat annular ring corresponding to a location of said lower intermediate surface on the upper surface and encompassing the central generally concave portion; an annular fillet curve encompassing the flat annular ring; and a rim foot encompassing said fillet curve, wherein the annular fillet curve extends substantially between the flat annular ring and the rim foot; and wherein the raised rim includes a rim top, and wherein a first thickness of the flying disc measured orthogonally to the rim top is greater than a second thickness of the flying disc measured orthogonally to the lower intermediate surface. 25. The flying disc of claim 24, wherein said raised central portion of said upper surface comprises a raised central dome that curves along a maximum diameter of the flying disc. 26. The flying disc of claim 24, wherein said form comprises a unitary piece of foam. 27. The flying disc of claim 24, wherein said rim foot is a lowest surface of the flying disc. 28. The flying disc of claim 24, wherein said lower intermediate surface comprises a flat annular ring. 29. The flying disc of claim 28, wherein the flat annular ring lies in a plane orthogonal to a central axis about which the flying disc is radially symmetric. 30. The flying disc of claim 24, wherein an overall height of the flying disc is between 10% and 15% of an overall diameter of the flying disc. 31. The flying disc of claim 24, wherein the flying disc weighs approximately 100 g. 32. The flying disc of claim 24, wherein the flying disc has an overall diameter of approximately 9 inches. 33. A flying disc, comprising: a radially symmetric form suitable for rotational flight when thrown by a human, said radially symmetric form having an upper surface and a lower surface; the upper surface including a raised central portion, a first flat annular ring encompassing the raised central portion, and a raised rim extending above and encompassing the first flat annular ring, wherein: a maximum height above said first flat annular ring of all portions of the flying disc encompassed by the first flat annular ring is no greater than a height of the raised rim; said raised rim includes: a sloped inner sidewall having a flat profile, said sloped inner sidewall having a greatest height at its outermost extent; a sloped outer sidewall having a flat profile, said sloped outer sidewall having a greatest height at its innermost extent; a rim top intermediate said sloped inner sidewall and said sloped outer sidewall, said rim top having a flat profile; and the lower surface includes: a central generally concave portion; a second flat annular ring corresponding to a location of said first flat annular ring on the upper surface and encompassing the central generally concave portion; an annular fillet curve encompassing the second flat annular ring; and a rim foot encompassing said annular fillet curve, wherein the annular fillet curve extends substantially between the second flat annular ring and the rim foot; and wherein a first thickness of the flying disc measured orthogonally to the rim top is greater than a second thickness of the flying disc measured orthogonally to the first flat annular ring. 34. The flying disc of claim 33, wherein said raised central portion comprises a raised central dome that curves along a maximum diameter of the flying disc. 35. The flying disc of claim 33, wherein said form comprises a unitary piece of foam. 36. The flying disc of claim 33, wherein an overall height of the flying disc is between 10% and 15% of an overall diameter of the flying disc. 37. The flying disc of claim 33, wherein the first and second flat annular rings are parallel to a plane orthogonal to a central axis about which the flying disc is radially symmetric. 38. The flying disc of claim 33, wherein the flying disc weighs approximately 100 g. 39. The flying disc of claim 33, wherein the flying disc has an overall diameter of approximately 9 inches. 40. A flying disc, comprising: a solid, radially symmetric form suitable for rotational flight when thrown by a human, said radially symmetric form having an upper surface and a lower surface; the upper surface including a raised central portion, a flat annular ring encompassing the raised central portion, and a raised rim extending above and encompassing the flat annular ring; wherein a maximum height above said flat annular ring of all portions of the flying disc encompassed by the flat annular ring is no greater than a height of the raised rim; and wherein a first thickness of the flying disc measured orthogonally to the raised rim at its maximum height is greater than a second thickness of the flying disc measured orthogonally to a maximum height of the raised central portion.