Imagine that you’re watching
Alfred Hitchcock’s movie, “The Lodger”. Hitchcock needed to show his
characters, on the ground floor, reacting to hearing their tenant (the titular
Lodger) walking around above them in his second floor apartment. But it was a silent
movie, so Hitchcock resorted to constructing a glass floor on the sound stage
and photographing up through it to show a man walking around (from underneath).
This drawing is inspired by this sequence, though, in the movie, if the lodger
had been walking around nude the people downstairs wouldn’t have been able to
hear him.