主权项 |
1. An apparatus for a user to balance upon on a contacting surface, comprising:
a) a body member bound by an upper surface, a lower surface and a circumscribing edge surface; b) a hub member extending from said lower surface, said hub member having an outer hub surface with a hub apex; c) at least one nub member extending from said lower surface, said at least one nub member having an outer nub surface, said at least one nub member located between said hub member and said circumscribing edge surface; and d) wherein said outer nub surface is raised relative to the contacting surface when said body member is balanced on said hub apex. |