When I was a kid I made contraptions similar to this using hotwheels tracks with differently sized holes cut into them and slips of paper. Wasn't turing complet

When I was a kid I made contraptions similar to this using hotwheels tracks with differently sized holes cut into them and slips of paper. Wasn't turing complete, but could do some things. I would have had a blast with this thing. I might buy one now so I can gift it to my nephew when he's a little older.