A black and white photo of a nail being pulled out of wood with a hammer.

A light ring attached to a hand for cyclograph pictures. Cyclography is the study of motion by photographing (up to hundreds of times a minute) light sources attached to moving parts of the human body. This image is from the Frank B. Gilbreth Motion Study Photographs Collection and is a part of the discussion on Productive Bodies during week 11. (Image courtesy of the Kheel Center on flickr. License CC BY.)