Warning: This will hurt your brain.
These 11 mind-bending optical illusions put together by Lenstore will question your understanding of all life's visual basics.
From colour to shapes, lighting to lines, it will be hard to trust your eyes after this.
It might not feel like it, but our eyes aren't actually tricking us.
The brain reacting to feedback between neurons in different parts of the visual system, therefore creating an illusion, according to a study by Carnegie Mellon University.
For example, changing the background or lighting is a commonly used technique in illusions, and contrasting colours even give the illusion of motions.
If you're really struggling, that might just be because you're a man.
Sorry, but studies argue that women are better at solving optical illusions than men due to colour blindness.
Men have a colour blindness rate of approximately 8 per cent in comparison to women at 3 per cent.