1. Box. To house a Pi, a capacitive sensor, a power supply, and cables, make an 8-inch-square wooden box. Nail together two 4-inch-tall sides, two 12-inchtall sides, and an 8-inch square bottom using half-inch-thick wood. Drill a circle of small holes into the lid for a sound port (but don't nail it on). To the 12-inch-tall sides, add an 8-inch-square plank that's bored to fit six beets.