Dynamic and functional. Lazy evaluation. Real immutable data structures. Core.async. A modern lisp not constrained by the exclusive use of parens, ie. [] for vectors and {} for sets & maps as with JS, Python and Ruby. Real REPL-driven development. Macros. Spacemacs with CIDER. Polymorphism which beats OOP at its own game. Massive Java ecosystem at your fingertips plus 25000 pure Clojure libraries and last, but by no means least - a rock 'n roll BDFL with a mullet.