The holographic principle suggests that the 3-dimensional reality we live in is a hologram projected by the 2-dimensional coding. It's like when a 2-D drawing seems like it's 3-D when drawn properly.

Theories such as relativity and string theory promote the understanding and the probability of the existence of the holographic principle. Another way of thinking about it, is how a 2-d drawing of a 3-d object contains all the information to recreate the 3-d object, such as the length, the height, or the width.

This concept was derived from stephan hawkings equation