2253. Exposed seats include a great variety, rising in gradation from the turf bank to the carved couch. Intermediate forms are stone benches, root stools, sections of trunks of trees, wooden, stone, or cast-iron mushrooms, painted or covered with moss, or mat, or heath; the Chinese barrel-seat, the rustic stool, chair, tripod, sofa, the cast-iron couch or sofa, the wheeling-chair, and many sub-varieties.