Here's why:

* The Electromagnetic Spectrum: The electromagnetic spectrum ranges from very low-energy radio waves to very high-energy gamma rays.

* Visible Light: This is the only portion of the spectrum that humans can see. It encompasses a range of colors from red (lowest energy) to violet (highest energy).

You can think of it like this:

1. Low Energy Side: Radio waves, microwaves, infrared radiation

2. Middle: Visible light

3. High Energy Side: Ultraviolet radiation, X-rays, gamma rays