The 5th Dimension, As Described By A Theoretical Physicist

Imagine fish swimming in a shallow pond, just below the lily pads, thinking that their “universe” is only two-dimensional.

​Our three-dimensional world may be beyond their ken. But there is a way in which they can detect the presence of the third dimension.

​If it rains, they can clearly see the shadows of ripples traveling along the surface of the pond.

​Similarly, we cannot see the fifth dimension, but ripples in the fifth dimension appear to us as light.

― Michio Kaku, Parallel Worlds: A Journey Through Creation, Higher Dimensions, and the Future of the Cosmos