Sadly, the swing has since been cut down.
If you’d like a print of this piece, snap a photo from this location and send it along to Zoe .(JavaScript must be enabled to view this email address). She will mail it to you (if you include your address) or hide it in the woods for you to find, with instructions. (Three prints are available.)
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If that's the tree I'm thinking of (near the Leitner Observatory on the Yale campus?) I'm glad it was cut down: the tree obviously was diseased/weakened after a lightening strike, and the swing was a potentially lethal hazard to someone's small child. I asked a tree service to address it with Yale grounds maintenance.