A little over two years ago, the startup Astro HQ emerged with an app that could turn an iPad into a drawing slate for Photoshop and other desktop illustration tools. Now, Astro HQ is back with a new product that goes even further: it’s a small piece of hardware that turns an iPad into a full-on second display, no wires required.

Astro HQ’s new product is called the Luna Display, and it’s supposed to look like a small crystal with a USB-C port sticking out of it. (A Mini DisplayPort version will also be offered.) I was able to try out a prototype — without the colorful casing — and it’s already working, though not quite as perfectly as I’d hoped.

The USB-C dongle is a bit smaller than a dime. You plug it into your Mac, then launch the…

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