[HeartlandOfAmerica]

Lukin also suggested that the system might one day even be used to create complex three-dimensional structures – such as crystals – wholly out of light.

Is he saying that they've created matter out of photons?

[LibWhacker]

Or created something that behaves like matter even though it isn’t. I’m still waiting for our resident physicists to chime in and help us understand... please guys (and girls), you’re needed! :-)