An e-reader built around tangible interaction: you turn pages by rolling a roller on its side. There is no reason, and no way, to beat the Kindle on reading features. So the software follows the usual e-reader conventions, and the rest of the effort goes into the object you hold while you read: material, machining, and touch.
After weighing 12 form factors, I settled on a slim landscape bar (120 × 70 × 12 mm). The width is worked back from the screen, the length from the controls.
Pages turn with a 16 mm roller on the side: 20 detents per turn, 2.51 mm apart, the same spacing as a mouse wheel. Roll slowly and it clicks; roll fast and it spins free.
A solderless prototype showed a 0.70 s e-ink refresh and about one second per page turn in real use. Next come soldering and an aluminium prototype.
