I got a reply from Holger Winnemoller!
I had a look at your webpage. Congratulations, you made very good use the illusions.
My Master's Thesis ended up focusing on NPR, specifically real-time optimizations to existing techniques and I never got around
to implementing NPR with optical illusions. I am currently at Northwestern University:
I have not looked seriously into using Illusions since my Master, but I have recently stumbled across some more illusions that might be useful and
I am thinking of revisiting that interest of mine. Good to see I am not the only one :-)
I still think that this area of research is a very interesting one and if you decide to pursue it (you seem to have some very good ideas) I'd be
interested to hear about it. If you have any specific questions (links to more illusions - have you seen my illusion page?, references, ideas)
let me know and I'll see how I can help you out. Best of luck,