There's nothing quite like an optical illusion to get the whole internet talking - and collectively scratching their heads. For some reason, a little trick of the eyes is something that really unites us all - perhaps because it's the sort of internet content that anyone can get involved in...

Optical illusions can really make you feel strange.

There's something about the way that they can disrupt our sense of reality that makes us feel incredibly uncomfortable.

And they're always popular online.

While a lot of internet content seems to be a little problematic, controversial, or divisive, it's nice to be able to all agree on something.

Just to sit back and enjoy something weird.

from pics
Like this bizarre picture in which at least one of the girls appears to have no legs.

Or what about this infamous image?

via: Instagram

This picture was originally shared on Instagram, and people went wild, questioning whether it showed some super greasy legs - or some expertly placed white paint.

For some reason, the feeling of confusion is strangely pleasant.

Perhaps it feels nice to give up control and admit that the world is just weird and crazy.

Although that isn't always the case.

Sometimes, a particular optical illusion will come along that just sends the internet crazy - and not in a good way.

And here are our selection of the best ...

Get ready to be freaked out!
For more optical illusions, scroll on ...