Awkward. That’s the word that comes to mind when I think of all of the 2-in-1, “convertible” laptops that have come to market in recent years, as PC makers try to adapt in a mobile-centric world and rejuvenate the market. A 13-inch or 15-inch laptop just doesn’t really work as a tablet. The option to detach a display from a full keyboard is a mild convenience, at best.

But Lenovo, which has made a bunch of these convertible creations, has come up with something that not only makes sense, but nudges the category forward with a completely new kind of keyboard. It’s called the Yoga Book, and it’s an incredibly thin and light tablet-like machine with a flat, touch-sensitive surface that lights up into a glowing keyboard. This lower panel…

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