Right Brain vs Left Brain
Here is the optical illusion about a lady turning clockwise or anti-clockwise… depends how your brain interpret the images… the results are amazing…
If clockwise, then you use more of the right side of the brain and vice versa.
Most of us would see the dancer turning anti-clockwise though you can try to focus and change the direction; see if you can do it.
If you cut a chocolate bar 5 on 5 and rearrange all the pieces in the order shown, then, out of nowhere, there will be an extra piece of chocolate. The same can be done with the usual chocolate and make sure it is not computer graphics, and is an existing puzzle!!