eruvin 75

inner and outer courtyards
houses and gatehouses

when the residents of one rely on the domain of the other for access.

eruvin 72

partitions aren't walls that make separate domains until they reach the ceiling
and brothers who still eat at their father's table aren't considered separate. even though they have their own houses in the courtyard.

(apologies for the picture quality - draw yomi over these couple of days is coming from Venice. a good place to think about courtyards, alleyways and residencies)

eruvin 66

courtyards that connect and separate

one resident's forgetting can affect another courtyard's ability to mix

eruvin 23

trees make an enclosed garden a courtyard.
that make it like a residency.