Kamon, Japanese family crests, via here.
kamon (家紋?), are Japanese emblems used to decorate and identify an individual or family.
The Enso is a symbol of the cyclical nature of existence (there is no real beginning or end but evolution during each cycle).
Japanese roof details: 鬼瓦 Onigawara
Japanese Onigawara Mask
脇阪克二のデザイン: design of Katsuji Wakisaka (Marimekko, Japanese Textile Designer) : book cover
blue and white Japanese plates ::: KOMON (family crest)