Focus

Infinity pools are beautiful, when you are in and around them, they look like the water is endless, or as if it blends either with an infinite amount of water or the sky behind them.

We have sketched how they really work; while your eyes are seeing a border of water that blends with the large amounts of water in the background or with the sky.  The water at the far border of the pool, actually flows into a reservoir in the back which is pumped back into the pool.

Some optical illusions take advantage of the fact that cameras and pictures as we know them are 2D representations of a 3D world. Creating this type of optical illusions requires placing yourself at the right angle to break the concept of scale and perspective.

Getting the right camera shot requires some preparation and time as well as good light conditions; to get objects close and far in focus and as sharp as possible you must maximize the depth of field. To achieve this, it is necessary to use the smallest aperture which corresponds to the highest f/ value on your camera. It is also recommended to focus the farthest object. The following pictures are beautiful achievements of this optical illusion:

This image by Looking Glass is a beautiful example of the illusion of scale in which this boy seems to be putting a finger on the top of a very small's person head.