(def t @{:a 1 :b 2 :c @[1 2 3]}) (def ct (table/clone t)) (put ct :a 3) # => @{:c @[1 2 3] :a 3 :b 2} (pp t) # => @{:c @[1 2 3] :a 1 :b 2} (update ct :c array/concat 4) # => @{:c @[1 2 3 4] :a 3 :b 2} (pp t) # => @{:c @[1 2 3 4] :a 3 :b 2} # array under key :c is shared between tables!