For
was it not stated: If an exedra was situated in a valley
Rab
ruled, it is permitted to move objects within all its interior (on Shabbat);
but
Samuel ruled: Objects may be moved within four cubits only.
Rab
ruled that it was permitted to move objects in all its interior, because we
apply [the principle:] ‘The edge of the ceiling descends and closes up.’ But Samuel ruled
that objects may be moved within four cubits only, because we do not apply [the
principle:] ‘The edge of the ceiling descends and closes up?’
At dispute is the idea
that a suspended roof can create ‘virtual walls’ which define the space.
Roman architecture and
virtual space combine!
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