Eagle-eyed viewers of professional sports entertainment have likely noticed that WWE’s “Hell in a Cell” cage is now red, instead of its traditional metallic hue, but have you ever wondered why? 

Because they painted it red. 

The coating of red paint gives the cage its red color. The paint reflects light at a certain wavelength that our ocular nerves register as the color “red.”

And there you have it!

Paint. 

You probably should have figured that out on your own, Einstein.