“'Why Knot?' for example, uses 10 electric motors to drive 10 mechanisms to construct a four-in-hand knot on a necktie that it wraps around its own neck. Grasping, pulling, aligning and winding the lengths of the tie, Mr. Knot can detect the occasional misstep or tear, untie the knot and get it right. Unlike Rube Goldberg’s whimsical contraptions, Mr. Goldstein’s is no mere cartoon. It works, if only for Mr. Knot. He cannot tie your tie.
Mr. Goldstein might be exceptional for the range of his skills, but he is characteristic of a sizable — and with the first of the baby boomers retiring now — expanding cohort of pensioners. Smart, agile and creative, they catch a liberating wind upon leaving the bosses, bureaucracies, commutes and time clocks of their workaday careers to tackle something consuming and new, whether for material reward or none at all.…"
Article by Peter T. Kilborn, photo by Matt Roth for The New York Times
Here it is in action: https://www.youtube.com/watch?v=c0atClPSTx8