Back in 2005, a small firm offered a tantalizing vision of the future of computer keyboards.
What if your keyboard was filled with tiny screens that showed you exactly what any given press would do, each built into a crystal-clear key? The keys would morph and shift as you needed, transforming from letters and numbers to full-color icons and app shortcuts, depending on what you were doing.
Readers and tech bloggers adored the idea. “It’s about time someone shook up this stagnant keyboard market,” declared Engadget. “The concept is fantas...