(I assume you&#x27;re Benedikt.)<p>This is beautiful work. Especially the write-up. I think we all understand the urge to code, but your desire to take the next step and describe what you&#x27;ve done is fantastic. Thanks for the gift.<p>This reminds me of those optics tables you see in museums, in the hands-on section for kids. Where they&#x27;ll have a table with a rectangular inset, and in it will be light sources and prismatic pieces of Plexiglas that you can move around. You see the light tracing paths and scattering.<p>I&#x27;ve played with these setups and find them disappointing. If these museums instead had tables with touch displays, they could run software like yours. Of course they could also run other apps and anything that runs on a phone, so maybe that ruins the whole &quot;this is special because it&#x27;s in a museum&quot; feel.