How many objects?
Curiously, there is no data (that I could find) on the number of "species" of objects that fill our lives. So I've been counting the number of technological species in my home. I'm interested in having a large data set than one, so if you'd be willing to count the full variety of things in your home (every object), I'd be thrilled. I can lend you my hand tally machine, and give you my guidelines.
At the same time, if anyone is aware of existing research on the number of manufactured "species" then please point me to it.