Have you ever felt like a ghost? Like you were there but not there, sort of "out of phase" with everyone around you? That's what I feel like today. Whether I'm sitting at my desk or walking down the hall or stairs here at work, I have the sense that no one else really sees me, and that they would just walk right through me if they got close enough. Even when someone talks to me, I have the sense that as soon as we stop speaking I'm not really quite visible to them anymore.
It's a very odd feeling to have.