Minneapolis photographer Mike Levad of Twin Birch Studios contributed to this interactive book for iPad, published by London's Touch Press on Apple's iTunes store. It comes with an app that shows (and explains) 26 everyday objects, in alphabetical order, that can be rotated, enlarged and transformed with a swipe of the finger. But here's the coolest part: swipe down, and the photo turns into an X-ray view of the object's innards -- clock springs, the bones inside a child's hand, the layers of an onion.