There was an interesting article in
http://www.scientificamerican.com/ar...round-the-mind.
The article centres around the use of building, but I'm wondering how
long before it creeps into garden design.
To be specific, the use of trees as these are sometimes said to
provide the garden with a 'ceiling'

ps if you want the actual magazine it's probably no longer in the
shops being, perhaps, out of date (Scientific American Mind ; April-
May-June) (starts on page 52)