Arthur C. Clarke wrote, \"Any sufficiently advanced technology is indistinguishable from magic,\" which is what Mercedes-Benz must be thinking with some of the new features in its 2013 SL550. Its Magic Sky Control consists of a panel in its retractable hard top that goes from dark to transparent at the touch of a button. That does sound very advanced. Not quite as magical is Magic Vision Control, a system that dispenses wiper fluid from openings on the wiper blade, rather than spraying haphazardly over the windshield from two jets on the hood. Although not called out as magical by Mercedes-Benz, the new SL550 includes other very advanced features. It will come with an automatic parallel parking system and a sensor under the rear that opens the trunk when someone waves a foot across it. Both of these technologies were recently introduced by Ford, stealing some of Mercedes-Benz\'s thunder.