irb(main):001:0> require 'pry'
=> true
irb(main):002:0> pry
[1] pry(main)> magic = Hash.new({})
=> {}
[2] pry(main)> magic['bird'] = 'in the hat'
=> "in the hat"
[3] pry(main)> magic.keys
=> ["bird"]
[4] pry(main)> magic['watch']['closely'] = 'this is the trick'
=> "this is the trick"
[5] pry(main)> magic.keys
=> ["bird"]
[6] pry(main)> magic['out']['of nowhere'] = magic['watch']['closely']
=> "this is the trick"
[7] pry(main)> magic.keys
=> ["bird"]
[8] pry(main)> magic['out']['of nowhere']
=> "this is the trick"
[9] pry(main)>