Are these men insane, or would you also be able to nonchalantly eat your lunch sitting untethered 800 feet in the air?
This famous image. Empire State Building, 1932. Construction workers having lunch as if it's no big deal that they're 800 feet off the ground and there's absolutely nothing tethering them to the building. Nobody seems to mind much that they're one off-balance moment from leaving a crater in the sidewalk.
Or perhaps there are some particularly fluffy mattresses at street level that we can't see.
Could you ever imagine yourself getting acclimatized to the point where you could be like these men, or are they exhibiting what you feel to be casual insanity?