Last week, I was cleaning out my keyboard. Did you ever stop to think that all the gunk in our keyboards is us? Our interactions with it fill the little cracks with hairs, skin cells, and little bits of sweat. I imagine that we're like our keyboards: when people interact with us, they leave a little bit behind, little impressions and thoughts, feelings. The only difference is that it cannot and never should be blown out with a can of compressed air.