Automated rotary image generation

A rotationally driven rendering device for displacing a granular substance in a cyclic rotary path, comprising:

• a circular enclosure having a series of perimeter teeth around a circumference and a motor;
• a rotating arm rotationally driven by the motor;
• a spur gear rotationally attached to a proximate end of the rotating arm at a center of the spur gear, the spur gear adapted to engage the perimeter teeth;
• a pivot linkage pivotally engaged with an elongated rendering member at a radial point on the spur gear, the radial point offset from the center of the spur gear, the elongated rendering member in a slidable engagement with a track, the track pivotally coupled to a distal end of the rotating arm;
• and
• a granular substance arranged for manipulation by a rendering element in communication with a guide element attached to the elongated rendering member for fixing a visual rendering of a path traveled by the rendering element, the elongated rendering member having an elongated shape extending parallel to the track and having a plurality of receptacles in a linear arrangement, each receptacle adapted to receive the guide element.