A basic lamp and lava lit room with on and off switches that create stone around the edge of the room

Additional Notes

I added a water switch from the ceiling which turns off automatically while the light switch is in the 'on' position, and vise versa (This eliminates any remaining lava by converting it to cobblestone). The wiring could be more compact, but meh. The only 'real' issue with the room is the necessity of mining the stone between activations