If you're fascinated (or baffled) by Google's spatially aware, three-dimensionally scanning Project Tango tablet, you can now buy and try one yourself. The in-development tablet is now (still?) $512, invite-free at the Google Store. While the device is no longer a conceptual toy, it's still expressly aimed at developers, as Google looks to them to add functionality -- and ideas as to what to do with those spatial sensors built inside. Perhaps the most unusual part is that this wider retail release was dropped a mere day before Google I/O kicks off. Don't get too aggrieved if Project Tango 2 suddenly appears.