She gave him tips about wrist action, momentum, angles of incidence, about which part of the cue ball to hit when, and about the need to care just enough that you noticed you cared, but no more than that.

NEWYORKER: Ziggurat

Dr Karp's patch mimics this action using minute needles made of plastic with tips that are rigid when dry but swell once they have pierced wet tissue.

BBC: 'Bed-of-needles' super-grip plaster for surgical wounds