----------- memo ------------(playground/image) http://images.google.co.jp/search?q=playground&hl=ja&lr=&c2coff=1&rls=GGLC,GGLC:1970-01,GGLC:en&start=0&sa=N&biw=1272&bih=654&sei=aIS8TtbOCKnzmAXTj_W4BA&tbm=isch
