Everyone loves a treehouse. But for some, venturing into the trees can seem like an almost impossible dream. Forever Young Treehouses is a Burlington, Vt.­based nonprofit organization that helps those dreams come true by building handicapped-accessible treehouses for children with disabilities.

It's a demanding craft. Because many of the children must use wheelchairs to get around, access to the structures is provided by long ramps. On one of the group's projects — an Ashford, Conn., summer camp for children with cancer and serious blood diseases founded by actor Paul Newman — maintaining the slope at the required 12 to 1 ratio...

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