We didn't think too much of Obscura Digital's multi-touch hologram when we spotted it last August, but evidently the company has been working overtime in order to outfit Hard Rock's newest cafe with a monstrous interactive video wall. Hard Rock Cafe Vegas Strip is the chain's second venue in Sin City, but it's far and away the one to hit if you're a self-proclaimed nerd. Aside from having access to a number of Microsoft Surface-based installations, you'll also spend a good bit of time navigating the Rock Wall. The 18- x 4-foot touch wall (video after the break) enables up to six guests to simultaneously surf through the outfit's expansive memorabilia collection, with options
