Whilst I was in Lier, I took a couple of experimental shots with my new second–hand Cokin P219 Prism (the linked page is in Russian, but at least it isn’t trying to sell me something it no longer stocks, and, anyway, there are some pretty pictures).
I’ve a long way to go to explore the full potential of this device, but you can see from this photo that it does have something to offer. The guy in the middle was pure chance, but he shows me something to exploring deliberately.
I very much want to try the filter in many different light conditions to see what comes out the other side.
I had another Prism many years ago, as you can see, but lost it because the English legal system is corrupt (it’s one of the reasons I left the country).