It’s easy for anyone unfamiliar with this scene to dismiss it as just another boring Cornell box.
Let’s put this in perspective for a second: You are looking at a caustic through glass of a caustic through dispersion.
- -A beam passes through a prism and spreads to various wavelengths (essentially it passes through glass and becomes colored caustics).
-One of the colored caustic (the green wavelength) passes through a slit and is reflected by a cylindrical mirror. This is a second level caustic.
-The green second level caustic lights the entire Cornell box and at the bottom half it passes through glass to make it a third level caustic.
In retrospect I should have made the cube shinny metallic so that it’s caustics seen through the glass pane would be fourth level caustics.