Tulip tree trunk
Originally uploaded by wereldmuis.
This is the trunk of a tulip tree. Now you can see the corrugated pattern as it runs up and down the tree.
A tulip tree may have several trunks growing up from one central root. In letterboxing, if a tree has two trunks, it may be called a "two-sister" tree. A "four-sister" tree has four trunks, and so on.
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