FORTUNE — Now that Apple (AAPL) has been spotted securing trademarks for “iWatch” around the world, the device that was once viewed as purely speculative is now assumed far and wide to be Tim Cook and Jony Ive’s next big thing.
And what exactly would an Apple wrist-computer do?
For some down-to-earth speculation we recommend the last 25 minutes of Horace Dediu’s Tuesday podcast (The Critical Path 91: Apple’s Douglss MacArthur).
For blue-sky thinking, nobody has yet matched the ideas that poured forth last February from Bruce “Tog” Tognazzini, a human-computer interaction specialist who was one of Steve Jobs’ early hires and spent 14 years at Apple, from 1978 to 1992.
His Feb. 9 Ask Tog blog post is still available, with added commentary and chapter headings that we’ve copied below for readers who prefer their science fiction executive summary-style.