I am trying to think how I’ve seen diametric used other than “diametrically opposed”.
Here are diametric robins. Maybe they are discussing politics. At any rate they are facing opposite ways. Look at how polite they are, taking turns singing and listening to each other speak with such attention. Diametric to our current politics, I think.
I took this last weekend at the Rotary President Elect Training. Hotel doors are more functional than glamorous. I curled up in a chair in this hall when I needed a little quiet time between meetings. I like the carving over the hall and the abundance of windows.