First is a circular cell filter. I used a Lee milky white diffusion filter and disposable drinking straws. It's a small-scale experiment inspired by the likes of pixelator and abstractor.
Next in line were some forays into the world of infrared. I made the infrared filter using the black leader from photography film. The different frequency spectrum enables a cool trick:
I also got an IR illuminator on the cheap. In the same vein, I made some IR goggles following this guide:
Finally, this pair of upcycled glasses was inspired by some prismatic diffraction goggles from Werner Piepers' MedienXperimente, which look like this:
Here's the construction steps and what I ended up with (parts used are a plastic bag and a styrofoam cheese packaging tray):