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Dear Don, I like you day/night problem. I have one which is "the hand" - I call tees dynamic concepts or fakes - they have forms (like a coil of rope which is a fake) but their expressions are so varied as to make a nonsense of any one version. Cheers keith On 3/09/13 1:01 PM, "Don Norman" <[log in to unmask]> wrote: >One of my favorite examples is night and day. Everyone knows what night >and >day are, but try defining the boundary: there are multiple "official" >definitions. Most of us just accept that dawn and dusk are neither day nor >night but rather some in-between state. ----------------------------------------------------------------- PhD-Design mailing list <[log in to unmask]> Discussion of PhD studies and related research in Design Subscribe or Unsubscribe at https://www.jiscmail.ac.uk/phd-design -----------------------------------------------------------------