Masonry (Noun)- Work done using stone, brick, or concrete : work done by a mason.

https://www.merriam-webster.com/dictionary/masonry

“He added, ‘Actually instead of looking at individual buildings, it makes more metaphorical sense to think of New York as one enormous chunk of masonry that has been cut up and carved away. This is the ultimate polis, through which humans move like nematodes.’ “.

This word was taken from our second reading and I found it interesting how Self used that word to describe what he saw while on his trip in New York. The meaning is something built of a particular structure.