Linus Akesson published an interesting article on a demo by him.

The demo features 9 sprites (hence the name) displayed simultaneously on a C64, hence the name.

There is another video dissecting the demo and how it achieves its "impossible" effect. What impresses me the most is not the dissection but the debugger and scanline visualisation tools shown in the video.

JSON Canvas looks interesting. It is far from the interactive infinite canvas display that I like and try to get towards with SVG::Drawboard but having an interactive (enough) renderer for simple input data would be nice, especially if I don't have to program it myself.