Browsing through a recent issue of my favourite in-print retro magazine, the aptly-titled “Retro Gamer Magazine“, I stumbled across an article about Laurence Bennion’s “Blacklighter” project. These are a series of prints on transparent film that react to UV “black lights”, and when combined with the vector video screen of a classic Vectrex console, look positively amazing.
Laurence’s site has heaps of details about the overlays, and a great gallery of images and videos:
https://www.blacklighter.co.uk/
And a frame is available to add even more of a 3D “holographic” feel to the overlay, from Clockwork Robot: