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Sum of a sequence of odd numbers is always the next perfect square (For example, 1 + 3 = 4, 1 + 3 + 5 = 9, 1 + 3 + 5 + 7 = 16, etc).
http://www.folklore.org/StoryView.py?project=Macintosh&story=Round_Rects_Are_Everywhere.txt
Sum of a sequence of odd numbers is always the next perfect square (For example, 1 + 3 = 4, 1 + 3 + 5 = 9, 1 + 3 + 5 + 7 = 16, etc).
http://www.folklore.org/StoryView.py?project=Macintosh&story=Round_Rects_Are_Everywhere.txt