We demonstrate visually why doubling capacity is the better strategy when resizing arrays. The visual proof makes simple amortised analysis more accessible to a CS2 audience.
@conference{blah09c,
  author = {Don Blaheta},
  title = {A visual proof of amortised-linear resizable arrays},
  booktitle = {Proceedings of the 14th Annual Conference on
      Innovation and Technology in Computer Science Education},
  address = {Paris},
  year = 2009 }
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