corridor, hall, tower
廊 centers on a long, covered passageway connecting rooms or buildings: a corridor or hall. The tower sense is a less common extension, likely from a tall, hall-like structure.
廊 combines 广 (building with a roof) with 郎, which likely provides the sound ロウ and may have originally referred to a side building or corridor.
Under a roof 广, the inner part 郎 looks like a long hallway with rooms off to the sides. Picture walking down a covered corridor in a traditional building.
For ロウ, imagine a long corridor in a row house: row -> ロウ, and you walk down the hall.
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corridor; hallway; passageway
art gallery (esp. artworks for sale); picture gallery
corridor; gallery; hallway; cloister (i.e. covered walk typically circling a building or garden, esp. in a palace or place of worship)
corridor; passage; hall
roofed corridor connecting two buildings; connecting passageway
Polish Corridor
central corridor; middle corridor
corridor connecting an annex to a pond-side building (in traditional palatial-style architecture)
humanitarian corridor
aisle (of a church)
interior hallway (esp. of an apartment building); enclosed corridor
porch; portico; colonnaded entranceway; ante-hall
corridor (belt of land)
being present in a gallery (esp. of an artist at their own exhibition)
exterior hallway (esp. of an apartment building); open-air corridor
small buildings at the sides of a Zen temple gate (containing stairs to the upper storey)
Japan Gallery Association; JGA
pillared corridor
corridor; gallery; platform; passageway
transept