Thrift’s Background

I was thinking that this very window I am currently typing in offers a good illustration of the background concept that Thrift talks about (and that I think is one of his most useful aspects).  If you click on the little tab “text” in the upper right of this window, it shows you the html in which this post is actually written.  But of course wordpress cloaks that code in a veneer that allows me to experience more or less a Word environment (which of course also has a similar structure).  In other words, my experience takes place in a foreground that depends on a background I don’t see (but can take steps to engage with if I choose)…

Foreground:

Background: