Across the river from the main city you will find a scaffold in the ground near a stonecutter. If you go down it, you’ll find my no-chamber for experimentations— it’s completely invisible to and devoid of influences from the outside world.
I’ve successfully constructed prototype logic gates— an and gate and a not gate, and I probably shouldn’t have to test an or gate. If I have enough time, I might even construct a half adder somewhere.
It really depends. I’ve seen hallways with OR logic for the switches. But I feel like that was not on purpose, because I really can’t think of a proper use case for that.