A few of the following do seem to be great optical illusions
SQUINT your eyes to see the picture
See for yourself-
CONFUSING?-
Indecisive arrow(To the right or the left?)
let’s fill the glass with water and watch
[The illusion is just due to refraction]
B is shorter than A. Let’s shift B’s position downwards,and watch
B, longer than A???
FLOATING-
[FUNNY!!]
What do YOU see?
[It is a pyramid if you can actually see the other side facing the sun]
For the below picture-
[3-D painted room]
Nice-
Probably clear now-
Standing on a RED BULL can?
Is HE carrying her/is SHE carrying him?

Nice:-

Oh NO, it’s a YES!

Nothing seems abnormal. Now rotating it 90 degrees, look what happens
Rotate it by another 90 degrees and now,
[It is an illusion caused as the cube is just a 2-D image that is perceived as 3-D]
Nice to look closely at-