The exhibition includes 50 specimens from the enormous and impressive brains of a sperm whale and an elephant to the tiny insect’s nervous system, which looks like small beads chained together in a line. The brain has evolved over a long period of time to form a better relationship with environment. We introduce a variety of hypotheses for the brain’s evolution, such as how the brains have become big, why the brains haven’t grown big in all living things, why the sulci (lines on the surface) of the brain were formed, how family and society relates to the brain’s evolution, and tactics with which insect’s brains remain small.