I have constructed dangerous thinking machine components in my no-chamber

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.