Abstract: A horizontal completely and freely rotatable seat about a central vertical axis, which seat has a central cylindrical socket portion having a lower larger bearing and an upper smaller bearing for a correspondingly shaped hollow bell-shaped plug with depending leg means for supporting said seat for free rotation about the plug. The bearings may be of antifriction plastic and anchored to the socket in the seat. The seat may comprise a hollow torus or donut-shaped container with a correspondingly shaped cover removably held on said container by a pair of diametrically spaced slip-cords. The slip-cords also may be used for holding the removable plug and leg means and for attaching a shoulder strap and/or belt clip for carrying the seat in its knocked-down or collapsed condition. The plug and leg means may comprise collapsible tripod legs with removable, replaceable and/or telescopic feet to best fit the surface upon which they are to rest and support the seat.