Ambulatory rocking device

A substantially hollow and light weight bi-ped supporting rocking-and-ambulating recreation device having transverse width substantially in excess of either its vertical height or longitudinal length, said device comprising top and bottom shell-like portions mutually engaging and supporting each other at a single mating lip encircling the periphery of said device, said top and bottom shell-like portions comprising respectively top and bottom transversely extending surfaces and front and back longitudinally spaced apart walls extending vertically from said top and bottom surface, said top surface comprising a substantially flat central portion bounded at each of its outboard ends by a downwardly recessed platform portion for locating and supporting a respective foot of said bi-ped, said bottom surface comprising a substantially arcuate portion bounded at each of its outboard ends by a downwardly extending rocking stop portion, and said front and back walls of said top member defining one side of said mating lip and comprising therealong contiguous first and second top wall portions and said front and back walls of said bottom member defining the other side of said mating lip and comprising therealong contiguous first and second bottom wall portions aligned coplanar respectively with said first and second top wall portions and mated thereto at said mating lip, said first portions of each said top and bottom wall portions being substantially coplanar in a first vertical plane to provide a primary support of said bi-ped in the verticle direction and said second portions of said top and bottom wall portions being coplanar in a second vertical plane different from said first vertical plane for a secondary support of second bi-ped in said verticle direction.