I have the blues – but in a good way. After all, Colorado skies are often blue, and having previously lived under skies that stayed grey for long stretches of time, I tend to notice and appreciate how frequently the sky looks blue here. At times, this recurrence has led me to wonder: why does the sky look blue at all? Over the winter, I looked into this appearance of blue. Doing so, I discovered stacks of relevant materials, along with lots of fascinating information about more moments when blue is visible in nature.