This brought back a childhood memory from the 1960s. Someone left a cardboard appliance box (refrigerator maybe?) on the street and, being a small child, I of course turned it upside down and climbed inside. It had a tiny hole in it, and it was a bright day. I discovered a reversed (and as I remember it upside-down) image of the street inside, and spent many happy hours watching it. At some point (weeks or years later) I had it explained to me.
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