Featured on PDR in the collection Agostino Ramelli’s Theatre of Machines (1588)

Instead of an e-reader, picture your favorite books on a portable Ferris wheel, a lazy susan of knowledge and imagination turned on its side. Supplement your jogging habit with a treadmill that literally mills, converting caloric expenditure into bread flour. Or flip another page to find: bandsaws and bellows powered by rivers; ecological cofferdams; and a fountain that uses hydrostatic pressure to sing the songs of birds, beckoning nightingales to preen beneath its spouting showers.