In a legendary graduation address, later turned into the book This Is Water, David Foster Wallace offered this allegory: “There are these two young fish swimming along and they happen to meet an older fish swimming the other way, who nods at them and says ‘Morning boys. How’s the water?’ And the two young fish swim on for a bit, and then eventually one of them looks over at the other and goes ‘What the hell is water?’”
Good lesson and good example.