Another interesting design decision for the interior of the building that deserves its own post is that the interior is very hackable. Most of the interior spaces are complete open with reconfigurable separators to adjust how the space is used, and there are large, open spaces, some of which extend sixty feet into the air.
There is also extensive use of glass invites people to write messages or draw pictures on it, or in some cases, paper up the glass entirely for privacy. One of the more morbid window drawings I saw can be viewed here (hard to see).
Gehry I believe has taken to using the euphemism "modifying the building" to describe some of the modifications that people are making to correct some of the building design. We took to joking around with this saying as we wandered around; e.g. when we propped open one of the doors using construction material, we were "modifying the building." One of the more humorous modifications I've heard about is that in one of the conference rooms someone placed a box with a brick in it over one of the buildings floor vents and labelled it "temperature control." It is good to see that Gehry doesn't take offense at these modifications, though I'm sure that some of the denizens wish they were unnecessary. In all fairness, at least they have control over their spaces in the Stata Center; the old NE43 building offered little opportunity.
There are also plenty of fun reasons to hack the building. The "Gates Building" logos are numerous and pristine, the MIT library terminals are running Windows and frequently bluescreen (they were hacked to run Linux during the dedication), and the Dreyfoos building has already spawned the Dreyfoosball table.
Related: Index of other Stata Center entries