Wheels by far. Gears are technically wheels. Every pulley has wheels. Some doors are opened and closed by wheels and gears. I just don't see doors outnumbering wheels. However there are a lot of doors in the world. Is there an answer?
Wheels by far. Gears are technically wheels. Every pulley has wheels. Some doors are opened and closed by wheels and gears. I just don't see doors outnumbering wheels. However there are a lot of doors in the world. Is there an answer?