Did you know that most people measure seven feet? That is, we measure seven of our own feet. It's not magic ... it's mathematical! The pedagogical side: This segment explains the concepts of units of measurement, unconventional units of measurement, unconventional measures and indirect measures. The concept of proportion is introduced by using unconventional visual links (proportions) in the human body that have been used by artists and designers for hundreds of years (eg, the human body is about 7 times the length of its foot). Indirect measurement helps to establish reasonable estimates for body part dimensions, illustrating the practical utility of unconventional measures that have been recognized and used for a long time.