We all know the brilliant white houses of the Greek islands or Andalusia. For a long time, people there have made use of the reflection to prevent the houses from heating up too much - even in the time without air conditioning. White is the indicator that at least the visible wavelengths of light are reflected - today we know that this is not the whole truth, of course. The heat rather comes from the (N-)IR spectrum of radiation. Even in this range, one can achieve quite a lot with classic white pigments. So a lot was done right in ...