I really don't understand how 'pinch to zoom' can be patentable. Imagine showing a touch-screen tablet to a group of people who had never seen one before. If

I really don't understand how 'pinch to zoom' can be patentable. Imagine showing a touch-screen tablet to a group of people who had never seen one before. If you said, "Look, here's how to pan an image. How would you zoom?" then surely a significant percentage would give you the 'pinch' answer within 10 seconds. Wouldn't that clearly demonstrate that the 'invention' was too obvious to be patented?