1. A feedback stacker comprising: a plurality of rings; a base; a cylindrical core extending in a perpendicular direction away from the base; a plurality of segments on the core, each segment including a sensor for detecting the presence of a corresponding ring; an audiovisual alert signal that signifies whether a correct ring is positioned on the cylindrical core in response to an audiovisual request signal; and a different colored visual indicator at each of the segments on the core, wherein the audiovisual request signal comprises illumination of one of the colored visual indicators and a voice command for a specific color.
8. The feedback stacker of claim 1 , further comprising a switch to select the type of audiovisual request signal to be used.