Two artisans are heaping up lumber in the form of layers. The process where the lumber is going to be piled up perfectly in six horizontal layers reminds us of the cerebral cortex in corticogenesis. One of the artisans below, on whose back a Chinese character ‘kan’ (‘stem’) can be seen, may play the role of the neural stem cell (radial glia cell), the source of new lumber (newly created neurons), and extends a rope (radial glia fibers) upward so as to carry the lumber properly to the top layer. The other artisan above is considered to play a role similar to the cells that secrete reelin. The reelin is a protein that regulates correct migration and positioning of neurons. Designed by TRAIS Co., Ltd. (Kobe, Japan)