Fidget Spinner

"Fidget spinners" are small, ball-bearing devices that the user can rotate between his or her fingers. The momentum of the toy provides a pleasing sensory experience, according to user reviews. Many spinners are marketed as aides for individuals with anxiety, autism and ADHD; Cppslee's spinner marketing patter on Amazon, for example, promises greater concentration for people with those conditions, plus an opportunity to "bring out that creative genius lying deep within you."