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  • Ralph Prescott thinks this is interesting:

To access public instance variables, precede the field name with a dot and a hyphen

From

Cover of The Joy of Clojure, Second Edition

Note

I believe this was added to better support idiomatic JavaScript which has variables all over the place. Idiomatic Java typically has accessor methods so something like
(.x (new java.awt.Point 0 1))
tends to "just work" in Java because of expected support for "Javabeans"