From early childhood, we’ve been taught to recognize the colors of the rainbow—red, orange, yellow, green, blue, indigo, and violet—using the iconic acronym ROYGBIV. We see them in nature, on color ...

“I have finally discovered the true color of the atmosphere. It is violet. The open air is violet. I found it! […] In three years from now, everyone will be wearing purple!” said Claude Monet. But not ...