I think this demonstrates things pretty well!
Timecode: 00:00 to 00:50 – what the client sees.
Timecode: 00:50 to 02:12 – what the developer sees.
Original location: http://gamevideos.1up.com/video/id/21880
This is a difference engine, or calculator, created in the upcoming
PlayStation 3 title, 'Little Big Planet'. (Which I can't wait to get myself).