Ah yes, the future! It's nice when it arrives on your front doorstep or on your iPod. It's even nicer when you ask for something and then you get it: a few months back, we drooled over Dentsu London's light extrusion tech demo and humbly demanded its App Store release. Now, app in hand, we're busy running around our houses trying to become some sort of half-baked Jenny Holzer. It's called Penki, and it takes your text / symbol input and turns it into 3D-flavored imagery via long-exposure photography. Sounds bodacious, right? But, as we all know, the future isn't perfect -- read on for the full account of our shiny jou