Although it's possible to create photons in almost any shape, more complex configurations become distorted when travelling through an optical fibre, making them harder to understand at the receiving end. (newscientist.com)
But after a certain point, the stem cells don't seem to know what to do; they can't evolve into complex configurations such as organs. (sciencemag.org)
Other swimming variations, such as the 8 - arm maze, have a more complex configuration demanding that the rodents integrate more information to reach the escapes. (jove.com)