Abstract: A participartory device for producing artwork which includes a canvas or other suitable art medium mounted between a plurality of rotatable support posts which extend perpendicularly upward from a base. The rotation of one support post drives the canvas causing a lateral movement of the canvas. The device includes a drive mechanism which, in the preferred embodiment, is a bicycle-like apparatus permanently attached to the base. The rear or drive wheel of the bicycle-like device engages a plate member which extends radially outward from one support post so that pedaling the bicycle-like apparatus causes rotational movement of the support post and lateral movement of the canvas. The individual pedaling the bicycle-like device can apply paint or other drawing media to the moving canvas thereby creating a design on the canvas.

Abstract: An apparatus that provides constant illumination in response to an AC input power source having variable magnitude. The input power passes through a full wave rectifier and is then switched by a solid state switching device having conductive and nonconductive states to a passive L-C filter. The output of the filter energizes one or more lamps to provide the illumination. A phase control circuit is responsive to a sync signal from the full wave rectifier and a feedback signal from the output of the filter and controls the phase angle conduction time of the solid state switching device at a repetition rate related to the frequency of the AC input power to provide constant illumination from the lamp.