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Can we change the title to be not click-baity?

Yes.

(Submitted title was "An image that alters your brain".)

I've tried this a few times and I've never been able to make it last more than maybe 4 days.

If effects last for more than 4 hours you're supposed to see a doctor.

Says whom?

It is a reference to erectile dysfunction medication disclaimers.

Says Hinkley on hacker news... Is this a trick question?

The brain does a lot of optimizations and filtering. Like when you look down, you don't see your nose, (even though its in the way).

but I do see my nose - in serious double vision, and way out of focus, but I do see it.

McCollough effect