Tactus Technology is a startup that has developed an accessory that can create transparent keyboard buttons on top of a touchscreen display. The company is working with Taiwan-based Wistron, Business Insider reports, to manufacture such a keyboard case accessory for the iPad, which should start shipping later this year. The cases, which will cost between $80 and $100, will work with help of a liquid that forms the physical buttons when such a feature is needed. The cases have two components, including a thin display layer that looks like a screen protector, but allows fluid to pass through it, and a hard-shell backing which will supposedly store the liquid in addition to protecting the device. With a push of a button,