Mature shoppers and makeup artists can experiment like preschoolers at fingerpaint with a thousand variations on the rainbow at this 6,000-square color lab. Skip out on department store masses; here experts calmly test out dramatic looks with scientific precision and towering stacks of pigment jars contain every color imaginable. The store offers more than 250 exclusive Pro products coupled with the extensive selection of colors found at a MAC counter. Customize your finds at the steel-table mixing station, where you can mash raspberry and tomato red for a color of your own creation or transform eyeshadow pigment into mascara. Consult the store for Pro products like the chromocakes ($25) and paint sticks ($22). A $35 annual fee scores Pro members access to the reference library, photo studio and master classes.