rob aylestone
Moderator
I'm involved in a project to collect together old lighting equipment - going back to the 1930s or even a bit earlier and we had some boxes of projection gear and we found some colour wheels. Rumour is that they date back to the 1970s Pink Floyd live shows - and the date and equipment type match. I can't find any photos though. They rotate and project lines and patterns. Things have moved on a bit!