Eggs of the Great White (Pieris brassicae) or Cabbage butterfly look like extraterrestrial buildings. They protect the embryo caterpillar and are equipped with pores to provide sufficient oxygene.  The eggs of butterflies can be orange, yellow, turquoise, dark gray or ivory, bear spines and have spots, stripes or spirals. It seems obvious that not only the laws of biology have helped to shape these little masterpieces – nevertheless, they are the result of an evolutionary process that has worked over millions of years!