36 38 there is positioned a deep recess 68 of the flap 34 from which the integral hinge 64 extends with a neck portion 72 defined by a clearance 74 between the hinge 64 and the main flap area the hinge 64 provides an anchor pivot 76 once the hinge 64 is fastened with the neck portion 72 tied down under the front seating surface 26 in the assembly of the chair 10 shown in fig3 similarly the peak of the lumps 36 38 provide side pivots 77 and 77 a about which the flap 34 swivels in two opposite directions for each flap 34 two identical sheet sections in a symmetrical shape may provide its exterior surfaces 78 the flap sheet may be folded along its center at a flat elongated area 80 over a foam core 82 which is generally shaped into the main body of the flap 34 providing the desired cushion effect the sheet sections may be glued and sewn together along a stitch line 83 in operation of the flap 34 on the chair surface 26 the lumps 36 38 are pushed aside whenever the flap 34 changes side and mode thereby providing a toggle flip action because either side pivot 77 or 77 a is virtually positioned at a location beyond the anchor pivot 76 into a depth of the seatback 22 the flap 34 is forced to lie flat on the seatback 22 whenever the user pulls the flap 34 and deflects it to the opposite.