Clay model of a house from the Fujiyama Tomb:

Tomb Period, end of 5th C. - beginning of 6th C., Shimotsuga County, Tochigi Pref.
A covered space created with groups of posts and beams to view the tide and moon and to conduct government This is the origin of Japanese mado, not only in the sense of "window," but as "hisashi," usually meaning, "eaves," but whose character has the meaning, "a place to see "