Was calibrating my DK2 yesterday and ran the demo scene (the desk with the stack of cards and soda can, etc). I tried to reach for the house plant and the can, knowing full well that they weren't there, and there was nothing triggered in my mind. Then I thought "it'd be fun to knock over the cards" and I swiped my arm through the space they would occupy, and my brain switched for a second or two and I fully expected to be hitting the cards and causing them to tumble. When it didn't happen, it was jarring, because it should have happened.
With the DK1 and DK2, those moments come almost randomly for me, and I keep wondering if we'll get to a point where they can be sustained for long periods of time, or if it'll be like those magic eye pictures where you finally see the sailboat and as long as you concentrate and don't blink you can keep looking at it.