There was one in a store we used to visit in the late ‘40s. It wasn’t a shoe store - more of a small department store. I’d stand on the thing, stick the fronts

There was one in a store we used to visit in the late ‘40s. It wasn’t a shoe store - more of a small department store. I’d stand on the thing, stick the fronts of my shoes into the two holes, lean over and look through the viewport (which was rather like an old stereopticon), push the button and wiggle my green toes. The clerks never bothered me. I think I knew enough to keep the time short. I don’t remember if it had a timeout - it probably did.