This seems like an impossible triangle.
This picture can be a horse if you look at it the way it is, or a frog if you tilt your head to the left.
This face looks like the word "Liar" if you tilt your head slightly to the right.
This picture can appear as a young girl or an old one.
The squares in this picture are perfect squares.
The lines and squares in this picture are perfect lines and squares.
The circle in this picture is a perfect circle.
There are only two different colors in this picture: green and red. Your brain thinks it sees two shades of red, but they are exactly the same. They look different because some are surrounded by green squares and the others are surrounded by white.
If you look at this picture and move your eyes back and forth, it looks as if the ovals are moving.
If you look at different spots of this picture or around it, it appears as if the wheels are moving.