Abstract: The toy is made with a hollow housing having a generally polygonal configuration in plan view, and having arcuate side walls which form pivoting axes about which the toy can tumble when positioned on an inclined planar surface, a stairway, or the like. The toy has at least two major planar sides whereby progressive tumbling movement of the toy occurs from one major planar side to another about ones of the arcuate side walls when the toy is positioned on an inclined planar surface. A sphere, or the like, is provided freely movable within the confines of the housing to impart momentum to the housing whereby the tumbling of the toy results. The tumbling movement is erratic due to the included angle between potential pivoting axes, and due to the intervening major planar surfaces on which the toy momentarily stops during tumbling.