The arched condition with the doorways allows for greater openings, that may be handy in buildings like barns or garages. That Section of an item furthest absent in the alternative route from that where an unsupported object would fall. a cardboard or plastic box employed for storage or shipping and https://share.evernote.com/note/ef9af445-e432-0c1f-8b91-b59c8631bfa6