The original Nest screwdriver let you choose from four different screwheads and fit neatly into the palm of your hand. It cost around $1.50 to make, so including it in every box was hugely controversial on a team that was focused on being lean and profitable. But the screwdriver’s friendly shape made installing the thermostat yourself seem less daunting, and it was so handy that it functioned as a marketing tool long after sale.
