I also think that bringing Harroway in the discussion is very
helpful. It is a key text used in my department and one that I find
very helpful as a border object between various sub-disciplines/perspectives
in the department.
On cooins as tools of reflection: Note the conditions under which
you can see two sides of the coin at once. The obvious way is to see
the edge and one side. But that is the coin seen held at a distance.
What if you bring the coin, vertically, as if standing on a table,
up close to your nose, right between your eyes. YYou will find there is
a moment when you can see the "two sides" but when this happen, the
edge side goes out of focus.
Hmmmmm.
mike