I had a surreal experience the other day. I was sitting in a coffee shop and watched someone (at the recommendation of a friend who didn't realize I was within earshot) open up my blog and start reading it. Right there, out of the corner of my eye, someone was experiencing me (well, digital me) for the first time.
Here it was, my first impression writ large. No fair running over and saying, "no, skip those two, those two aren't so good, go back a month or two and read the generous, thoughtful ones I wrote..."
It's like DNA. One cell carries the coding for all of them.
That meal you served at lunch yesterday might be the first impression, or that comment you left on someone's page or that customer service interaction with the new guy at your big client's office...
There's a riot of information racing by, and to survive, we snatch little bits and then magnify them into what we embrace as the full picture. Nuance? No time for nuance.
Every interaction might be the whole thing.