I think the joke is that there’s indeed unequivocally just three, and that one of them still says four despite that fact, contradicting the readers expectations who normally for this format expects the middle thing to be something that changes with perspective (eg. 6 vs 9)
I can’t see four. I’m sure it’s there, it just doesn’t appear to me.
I think the joke is that there’s indeed unequivocally just three, and that one of them still says four despite that fact, contradicting the readers expectations who normally for this format expects the middle thing to be something that changes with perspective (eg. 6 vs 9)
Originally it was supposed to be an optical illusion that looks like three or four rods from different angles.
This edit has changed it to be just literally three. It’s a joke on certain people denying reality.