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irb(main):010:0> a = [1, 2]
=> [1, 2]

irb(main):012:0> m = Matrix[a]
=> Matrix[[1, 2]]

irb(main):013:0> m2 = m.clone
=> Matrix[[1, 2]]

irb(main):014:0> a << 3
=> [1, 2, 3]

irb(main):015:0> m
=> Matrix[[1, 2, 3]]

irb(main):016:0> m2
=> Matrix[[1, 2]]

irb(main):017:0>