Polygogo is a stereo Eurorack oscillator based upon E-RM's own polygonal synthesis.
“complex polygonal amplitude shaping in a 2-dimensional space which is projected into the time domain to derive strictly orthogonal signals.”
Take a polygon and spin it in a 2D space and if you plot the 2D movement over time it creates a wave. You generate sine waves this way when you plot a position on a spinning circle.
The idea of Polygogo is that you are able to interact with the shapes and easily hear how this affects the output. The module has a graphical representation of the shape on the module itself.
More info at E-RM