This is a demo version of my 3D program The Green in which I have added a vertical mirror. This  was first done for the Gamedev.js Jam 2021.
New version 21.5.8 includes more features, including "Quarky Queens" (if you click through the mirror).

I realise that going through the mirror is too slow but there are interesting things the other side!

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ProgrammingAMirror.pdf 48 kB