This is Part 3 of my recital of the "The Matrix and Diamond World Mandalas in Shingon Buddhism" by Adrian Snodgrass. Shingon Buddhism is, put simply, the Japanese version of Vajrayana Buddhism. Kobo Daishi traveled to China and received the teachings and scriptures of Vajrayana Buddhism, then returned to Japan and founded the Shingon school at the top of Mount Koyasan in 815 CE, where it still flourishes today.