The main breakthrough here is the fingertips' stretchability and flexibility. Plenty of haptic feedback devices exist, but they're largely bulky, or flat, or otherwise unable to morph very well to the soft geometries of the body. This system is very similar to the first peelable, temporary tattoo-like skin electronics Rogers and colleagues developed last year. In that system, morphable electrodes are pasted onto the skin with water, hence the comparison to temporary tattoos. They could be used as health monitoring devices or machine-human interfaces, among other uses.