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An apparatus for sitting, including: a keystone assembly which connects various parts of the apparatus; a back that provides support for at least a person's back or shoulders; a floating lumbar support, which provides support for a person's lower back, attached to the keystone assembly; a seat that

An apparatus for sitting, including: a keystone assembly which connects various parts of the apparatus; a back that provides support for at least a person's back or shoulders; a floating lumbar support, which provides support for a person's lower back, attached to the keystone assembly; a seat that can adjust between a forward tilted and reclined position; a plurality of rollers, disposed on the keystone assembly, on which the seat rests; a central column, attached to the keystone assembly, on which the seat can spin; and a lower torsion spring connected to the seat and disposed on the keystone assembly allowing controlled movement of the seat.

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1. A chair, comprising: a seat with a back support;a base with a column extending upwardly therefrom, the base being substantially vertically aligned with a central axis of the chair;a plurality of legs extending radially from the base;a plurality of wheels;a support assembly having a body portion l

1. A chair, comprising: a seat with a back support;a base with a column extending upwardly therefrom, the base being substantially vertically aligned with a central axis of the chair;a plurality of legs extending radially from the base;a plurality of wheels;a support assembly having a body portion located on the column under the seat, the support assembly having a downwardly extending arm located below a front portion of the seat, the downwardly extending arm having a lower end, the lower end having a first spring;at least one upwardly extending arm connected from the first spring to the seat; anda floating lumbar support having a lumbar support arm connected to the support assembly via a second spring,wherein the first and second springs cooperate so as to enable the seat to have a combined forward-and-backward and tilting movement,wherein each said leg is bent and forms a plurality of leg portions, a first leg portion being substantially co-planar with and connected to the base and extending outwardly therefrom, and a second leg portion extending upwardly from a distal end of the first leg portion, and a third leg portion extending outwardly and downwardly from an uppermost end of the second leg portion, the first, second, and third leg portions being integral with one another, andwherein each said wheel is connected to a distal end of the third leg portion of a corresponding leg. 2. The chair of claim 1, wherein the at least one upwardly extending arm has an arc of movement, the downwardly extending arm being fixed in position relative to the body portion of the support assembly. 3. The chair of claim 1, wherein: as a sitter moves from a neutral upright position to a forward tilt position, the at least one upwardly extending arm moves forward with respect to the downwardly extending arm, and the lumbar support arm pivots forward with respect to the seat,as the sitter moves from the neutral upright position to a reclined position, the at least one upwardly extending arm moves rearward with respect to the downwardly extending arm, and the lumbar support arm pivots backward with respect to the seat. 4. The chair of claim 1, wherein the at least one upwardly extending arm moves forward with respect to the downwardly extending arm as a sitter moves to a forward tilt position. 5. The chair of claim 1, wherein the at least one upwardly extending arm moves rearward with respect to the downwardly extending arm as a sitter moves to a reclined position. 6. The chair of claim 1, wherein the back support is attached to the seat. 7. The chair of claim 6, wherein the back support comprises an opening through which the floating lumbar support may pass. 8. The chair of claim 1, further comprising at least one roller disposed on the support assembly, on which the seat rests and/or slides. 9. The chair of claim 8, further comprising: a third spring connected to the body portion of the support assembly, anda floating arm extending upwardly from the third spring towards a bottom surface of the seat. 10. The chair of claim 9, wherein the floating arm has a roller on an end opposite the third spring. 11. A chair, comprising: a seat with a back support;a base with a column extending upwardly therefrom, the base being substantially vertically aligned with a central axis of the chair and the column being height adjustable so as to correspondingly adjust a height of the chair;a plurality of legs extending radially from the base;a plurality of wheels;a support assembly having a body portion located on the column under the seat, the support assembly having a downwardly extending arm located below a front portion of the seat, the downwardly extending arm having a lower end, the lower end having a first spring, wherein the first spring is nearly at ground level when the height adjustable column is at its lowest height;at least one upwardly extending arm connected from the first spring to the seat; anda floating lumbar support having a lumbar support arm connected to the support assembly via a second spring,wherein the first and second springs cooperate so as to enable the seat to have a combined forward-and-backward and tilting movement,wherein each said leg is bent and forms a plurality of leg portions, a first leg portion being substantially co-planar with and connected to the base and extending outwardly therefrom, a second leg portion extending upwardly from a distal end of the first leg portion, and a third leg portion extending outwardly and downwardly from an uppermost end of the second leg portion, the first, second, and third leg portions being integral with one another,wherein the plurality of legs extend away from the column so as to define a recess therebetween in which the base is located, the recess receiving the first spring as the height adjustable column is lowered, andwherein each said wheel is connected to a distal end of the third leg portion of a corresponding leg. 12. The chair of claim 11, wherein the at least one upwardly extending arm has an arc of movement, the downwardly extending arm being fixed in position relative to the body portion of the support assembly. 13. The chair of claim 11, wherein: as a sitter moves from a neutral upright position to a forward tilt position, the at least one upwardly extending arm moves forward with respect to the downwardly extending arm, and the lumbar support arm pivots forward with respect to the seat,as the sitter moves from the neutral upright position to a reclined position, the at least one upwardly extending arm moves rearward with respect to the downwardly extending arm, and the lumbar support arm pivots backward with respect to the seat. 14. The chair of claim 11, wherein the at least one upwardly extending arm, the downwardly extending arm, and the lumbar support are generally parallel to one another when the chair is in a neutral position. 15. The chair of claim 14, wherein: the at least one upwardly extending arm moves forward with respect to the downwardly extending arm as a sitter moves to a forward tilt position, andthe lumbar support arm pivots forward with respect to the seat as the sitter moves to the forward tilt position,the at least one upwardly extending arm moves rearward with respect to the downwardly extending arm as a sitter moves to a reclined position, andthe lumbar support arm pivots backward with respect to the seat as the sitter moves to the reclined position. 16. The chair of claim 11, wherein the back support is attached to the seat and wherein the back support comprises an opening through which the floating lumbar support may pass. 17. The chair of claim 11, further comprising: a third spring connected to the body portion of the support assembly, anda floating arm extending upwardly from the third spring towards a bottom surface of the seat. 18. The chair of claim 17, further comprising at least one roller disposed on the support assembly, on which the seat rests and/or slides, and wherein the floating arm has a roller on an end opposite the third spring. 19. A chair, comprising: a seat with a back support;a base with a column extending upwardly therefrom, the base being substantially vertically aligned with a central axis of the chair;a plurality of legs extending radially from the base;a plurality of wheels;a support assembly having a body portion located on the column under the seat, the support assembly having a downwardly extending arm located below a front portion of the seat, the downwardly extending arm having a lower end, the lower end having a first spring;at least one upwardly extending arm connected from the first spring to the seat; anda floating lumbar support having a lumbar support arm connected to the support assembly via a second spring, wherein:the first and second springs cooperate so as to enable the seat to have a combined forward-and-backward and tilting movement,the at least one upwardly extending arm, the downwardly extending arm, and the lumbar support are generally parallel to one another when the chair is in a neutral position,the lumbar support arm pivots forward with respect to the seat as the sitter moves to the forward tilt position,the lumbar support arm pivots backward with respect to the seat as the sitter moves to the reclined position,each said leg is bent and forms a plurality of leg portions, a first leg portion being substantially co-planar with and connected to the base and extending outwardly therefrom, and a second leg portion extending upwardly from a distal end of the first leg portion, and a third leg portion extending outwardly and downwardly from an uppermost end of the second leg portion, the first, second, and third leg portions being integral with one another,a recess is defined between the column the first leg portions of the legs, the recess being adapted to receive the first spring as the chair is lowered and to allow the spring to rotate uninterruptedly about the column as the chair is correspondingly rotated, andeach said wheel is connected to a distal end of the third leg portion of a corresponding leg.