Mud Drying Shapes
Country: United States
Date: Spring 2010
Why does mud seem to dry in triangle shaped cracks?
I do not think the majority of mud tessellations are triangular.
I believe the triangular tessellations in mud that you saw are just one
example of many possible outcomes.
Here is an excellent article about tessellation.
You might find other articles by Googling "tessellation".
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Update: June 2012