This is a rather unusual and "creative" use of "ramble". com/en/definition/rambling ). As far as I can understand it, this author seems to have taken this idea and used it to create a noun "ramble" meaning an irregular spread.
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This is a rather unusual and "creative" use of "ramble". We use the word "rambling", of a building, to mean "spreading irregularly in various directions" (https://www.lexico.com/en/definition/rambling). As far as I can understand it, this author seems to have taken this idea and