SAN FRANCISCO — At sunrise and sunset, only ROY shows up for rainbow duty—G and BIV don’t appear for the earliest and latest color shows in the sky. Rainbows, it seems, are far more complex than the ...

There are many lovely ways to organize a bookshelf, but the rainbow shelf is one of the most aesthetically pleasing. Sure, you may want to arrange your books by genre, or author, or alphabetically by ...

When designers want to visualize changes in data, like in a heat map or a topographical survey, they often reach for the rainbow. The rainbow color scale is almost the default for visualizing ...