Avogadro Project
The Avogadro Project builds meta-canvases; that is, smaller versions of (areas of) the main canvas within the canvas itself, often being mapped to shaped surfaces. Examples include mirror balls, an etch-a-sketch, Bob Ross painting the canvas on a literal canvas.
additional info: https://web.archive.org/web/20210726200331/https://pxlsfiddle.com/avogadro/