Used as I am to presentations, I normally adjust on the fly when I see a divergence between what I'm sending and what delegates are receiving. So Sunday evening puzzled me, until I realized it was the first time I've presented with spotlights in my face, so I couldn't see who I was talking to. Clearly I've learned unconsciously to calibrate via peripheral vision alone. So, an insight!
And blindingly obvious. In hindsight. (Visual metaphors, right?)