So I do not understand why calling

  (defn evolve []
    (Thread/sleep 1000)
    (print ".")
    (recur))

Never results in anything being printed until I press Ctrl-C at which point 
a bunch of . are printed.

However if I remove (Thread/sleep 1000) then it works as I would expect.

I thought (Thread/sleep 1000) would basically wait for a second (allowing 
other threads to run) and then continue but it *appears* to work as I would 
expect but it blocks output (both to the console and, I think, to the 
seesaw frame/canvas created separately).

Help?

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