Yeh, for me, it's the eye strain from my eyes trying to "focus" on an image that's already focussed (and impossible to resolve the way my brain thinks it should be). This is similar to the Buscemi-with-four-eyes picture[1] - it tricks your eyes into continually changing focal distance in an attempt bring the picture into focus. It is physically straining your eye muscles.

1. https://i.pinimg.com/originals/85/21/c9/8521c9f0eefb09245edf...

Speaking of festivals, the Boom Festival logo has it too.

https://boomfestival.org/

But others letters are made the same way, a bit like the font in the article. So, less creepy, I guess.

Oh, now I know why I hate that ladder E: your sight tells you it's an E, but it has a bit more up, so it analyses it, and it's still an E, and the process repeats until your sight tells you that can't possibly be an E anymore.

It has the same vibe than this novelty facemask, if you wore several of them: http://www.naijanetwork.com/uploads/imageupload/997/FLM4TP8P...