Thanks, that was exactly what I was looking for!
I started playing around with two mirrors facing each other, but then the reflection of mirror1 is not reflected in mirror 2. Instead, you'll see a black square at the position of mirror2 in the reflection of mirror1. And when you look into mirror2, you'll see a black square at the position of mirror1. Both mirror reflections work well for the rest of the environment. I was wondering if it is possible at all to fix this. I don't really need the solution, I just want to know if it is possible. But if the solution is quite simple, then I'm all ears (or eyes
).