Could you please elaborate on Hickey’s and Kay’s key ideas and how to try them hands on? I know about Smalltalk (Squeak) so I guess that is the playground for

Could you please elaborate on Hickey’s and Kay’s key ideas and how to try them hands on? I know about Smalltalk (Squeak) so I guess that is the playground for Kay’s. Would just playing with Clojure do the same for the Hickey’s?