Woodworker and piano technician Jack Houweling wanted a stool for his shop that he could comfortable sit on. He also wanted one that he could confidently stand on. The answer was a stool with deployable/retractable legs.
The design that Jack came up with is super simple, easy to build, and uses common shop tools and materials that you may already have on hand: plywood, nuts, bolts, and washers. That’s it.
Once built, the legs tuck up under the body of the stool when it’s in step stool mode. To make it into a sitting stool, you simply hold the stool by the handle built into the seat, give the stool a firm shake, and the legs deploy. Satisfying.