As we were eating lunch, EM was crowing about her excellence in using her peripheral vision.
EM: Look, Papa! I can see you.
Me: That's great, holding up my hand, how many digits am I holding up?
EM keeps her head facing forward, but her eyes noticeably slided over to look.
After much laughter, her mother explained the proper use of peripheral vision, and we demonstrated by example, I held up my hand for my dear wife to count digits and ...
EM and Isabel, in direct view of my demonstration, shouted together: Five!
... at which the parents did the only thing left to them, exchanged high fives.
N.B.: see how I artfully side-step the great "Is the thumb a finger?" debate. Digits come from the Latin: di meaning ten and gits from the Sawfern (e.g. Git on ovah he-ah, so I can learn you real gooh(d)!)