Inventory Analysis
When I emptied my pockets, I found exactly 90 items. 90 things, on me while I was in class. This prompted me to think about how we think about stuff in terms of what we need and what we don't need, and how we use containers to increase the number of things we can carry without appearing to be pack rats.
Storage Containers were the first thing I noticed: bags, flash drives, computers, purses, wallets - we all have these on us, usually at least two or three of them.
The second thing was Security items - items that represent something important, but we hold onto them so we don't lose everything when we lose them. Things like debit/credit cards, where if you lose the card you don't lose all the money in your account.
This led me to the concept of Enablers - credit cards, membership cards, tickets (ticket stubs), keys - things that allowed us to do other things or go places. I had a very large number of these things, and in fact they represented more than 20% of the total number of objects that I had on me.
Presentation available here for those who would like to see it. It's in a keynote wrapper, so I hope you have iWork.