Product news: this wind-up toy by British design brand All Lovely Stuff creates abstract art when let loose on a sheet of paper. Inspired by the cotton-reel tanks they played with as children, All ...

Remember the Spirograph toys you had when you were a kid, which let you draw mathematically precise hypotrochoids and epitrochoids (or, as I called them, “neat shapes”) without cracking a sweat? What ...