My poor friend David. I drag him to a temporary exhibition that's all about color and the man is colorblind. So his experience of this piece was completely different than mine. In related news, shortly before we left for the Hirschorn, David says: "What is the difference between blue and purple?" And now, photos of David at the Hirschorn: This photograph is particularly interesting to me because he is red/green colorblind. This probably looks like a normally-lit portrait to him.