References:http://www.ceem.unsw.edu.au/content/userImages/TheVillageGreenatUNSW.jpg
http://www.torabiarchitect.com/parametric_array/images/multiturn_spiral_stair.jpg
http://latimesblogs.latimes.com/photos/uncategorized/2009/02/02/trees.jpg
http://www.mccullagh.org/db9/10d-16/aspen-trees.jpg
http://www.teachingideas.co.uk/maths/files/shapes2a.gif
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