Humanae by Angelica Dass.
Besides being an interesting photography project, I find this really useful. One of the perils of color correction work is that after a while one starts to question how certain colors (for instance: skin) are supposed to look like. Not only your sight adapts to certain hues (blue-ish, orange-ish, etc.) until they seem neutral, but after a while you find yourself in a position similar to someone who repeats the same familiar word out loud until it seems strange and meaningless. So, no matter how good and calibrated your monitor is, objective electronic assistance is very much needed (if available, the vectorscope function is your best friend), and having a list of skin tones at hand can help — not forgetting one should always ask “what color is this skin under this light?”, a question that some decline to answer… Designboom