When kids grow up with musical parents…especially ones who lead a choir (“conduct” might be a wee bit too glamorous a word for either of us)…you get this…
…and you get this…
…which leads, most adorably to all, to a 4-year-old who says seriously, “Mom, look at my invisible trombone!” Which, when he is interrupted in playing to clean up random toys, he carefully places in its invisible case, closes its invisible clasps, and stands on its invisible end before doing as he’s told.
Kathleen M. Basi 
I love the invisible trombone line. Sometimes kids need to get a little creative!