"Tangle'' (300-foot-long rope made with acorn caps), by BETH GALSTON,  in the show "Branching Out: Trees as Art,'' at the Peabody Essex Museum, in Salem, Mass.,  through Sept. 20, 2015.

She collected the acorn caps under a single red oak in Boston's Arnold Arboretum.

"The capitalists will sell us the rope with which we'll hang them.''

-- Lenin