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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Backyard and Beyond 
What is that?
Sap.
It is also a demonstration of the difference in the perception of time between humans and trees. To a tree this floe if vital fluid and resulting local plunge in fluid pressure is the human equivalent of lopping off a digit. The outflow of blood would seem rapid and significant to us.