My home darkroom, now decommissioned, in glorious cylindrical projection. On the left you can see my colour-coded 4x5 development tanks, home-made enlarger timer built from old-fashioned 4000-series CMOS logic chips, and a Beseler 45 MCRX enlarger. The door has vents cut into it to allow airflow, and baffles on the back to form a light trap. The box with the clock attached is built over the window, and contains exhaust fans and light-trap baffles. It has a hatch in it so you can reach through to open the window to allow the fans to suck the fumes out.