Personal Body Unit Index is a tool to sharpen your internal sense of physical scale. Personal Body Unit Index is a poster featuring a series of diagrams of the body in 17 useful positions for measuring things which relate in scale to the human body.
Each diagram has an area to pencil in your personal dimensions. You probably know how tall you are, but do you know your fathom? That’s the distance between the tips of your fingers when you spread out your arms (aka wingspan).
Living with Personal Body Unit Index as a reference chart, as something that you can peek at on the fly, helps build up your superpower sense of scale.