Primary colors. The mere thought brings us back to mandatory art classes in high school, but do we actually remember what they are? Here's your lesson for the day: primary colors are the hues you can mix together to create other colors. And that notion — according to Obsessive Compulsive Cosmetics — is the basis for a new DIY  lipstick kit. The beauty brand has just launched a set dubbed Primary Pack  ($29). You can easily wear the five colors separately or mix them. NSFW, a classic red is easy to rock; while Traffic, a yellow hue, may be a bit harder to pull off. The kit even has an easy-to-follow guide to get your color combinations perfect. NSFW and Tarped (the black) create a dark crimson, while RX (blue) and Tarped create a dark blue we're eager to try. You're basically getting 12 different lip shades, even though you only bought five. And if that isn't economically savvy, then we don't know what is.