Abstract: A pair of separate but adjacently coupled, flexible, deformable, fluid filled resilient volumes are confined in an enclosure and are connected by a laminar fluid flow maximizing fluid pathway. The volumes, through fluid action, respond reciprocally to each other when body weight is applied alternately to each filled or partially filled volume. Through the use of a variable control fluid port inlet, a variable control fluid port outlet, and a variable control laminar fluid flow maximizing fluid resistance, the volumes characteristics can be modified in firmness, softness, height, depth and resistance to fluid flow.