Adaptive-support furniture includes several support rungs, a first and second frame members, several pulleys as well as first and second elongate flexible members. The support rungs each have first and second ends. The first frame member at least partially houses the first ends of the support rungs while the second frame member at least partially houses the second ends of the support rungs. The pulleys are provided to the first and second ends of the support rungs and to the first and second frame members. The elongate flexible members are threaded through the pulleys of the frame members and the pulleys of the ends of the support rungs such that motion of the ends of the support rungs is interdependent.