(Credit: SIP, Guy Luethy et al.) Where SIP Lab’s DeltaPen comes in as an attempt at a smart pen that acts more like the pen of a drawing tablet, just minus the tablet. This project is related to ...
【Convenient Spiral Bound】--Designed with sturdy spiral bound on the top, this art sketch pad provides better access to flipping the pages. You will have no trouble detaching paper---keeping ...