733. An Archway

Shabbos 16:20

Does an arch, which doesn’t have two verticals posts plus a horizontal beam across the top, count as an entry frame? It does if the vertical parts on the sides are ten handbreadths tall (about 30”). An entry frame built to the side of a partition is disregarded because entrances are built in the middle of walls, not in their corners.

Shabbos 16:21                                                                          

A partition may be made of any material: utensils, food items – even people (see 16:23)! Animals and birds may also be used so long as they are tied in place to keep them from leaving.