Describe a small app you want. A stretch timer that hums every 30 seconds. A tally for cups of coffee. An AI living on your phone creates it, offline. Then you draw a glyph, and that glyph is how you open it from then on. The home screen is a canvas: scratch the mark, the tool appears. Nothing leaves the device, nothing is a template, and anything you don't like you can change by asking. Cantrips are small enough to make on a whim and personal enough to keep.