As rumored, Samsung showed off a prototype of a folding display today. Folded, it’s a smartphone. Unfolded, it’s a tablet. Neat!

Less neat: The company sort of went out of its way to not really show very much. A prototype was onstage for about 45 seconds, and it was deliberately backlit to be intensely silhouetted. They “disguised the elements of the design” to keep secret whatever secret sauce they have.

Finding that clip of the prototype folding/unfolding means digging through Samsung’s two-hour developer keynote, so we went ahead and GIF’d it up for you.

Here’s what it looks like going from phone mode to tablet mode:

And from tablet mode back to a more pocket-friendly phone mode:

While this isn’t the first folding phone we’ve seen , it also won’t be the last. With Google officially adding support for folding displays into Android as of this morning, it sounds like they’ve got reason to think a number of manufacturers are dabbling with this concept — enough of them, at least, to make it worthwhile to wire these changes into the main Android codebase.

If you want to see the relevant bit of the Samsung keynote for yourself, it starts juuuust before the 1 hour and 25 minute mark in the stream embedded below: