Sure you would be astonished, but here is how it works: It is possible by checking Mobile Safari Position. Whenever Mobile Safari changes position from horizontal to vertical, a web server notices the changes and via a JavaScript, and some electrical engineering, changes the position of the can and moves it up and down.
P.S. Who knows what would be another surprise from iPhone?
References:
http://www.ubergizmo.com/15/archives/2008/05/iphone_waters_plants.html
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