Designers Che-Wei Wang and Taylor Levy of CW&T has recently launched an offset poster print of Personal Body Unit Index. This brilliant concept allows you to measure objects and furnitures with your own body when no measuring tools are at hand.
Many of the 17 measurements featured in Personal Body Unit Index have historical precedence rooted in some ancient unit of measurement. The cubit, for example, is an ancient unit based on forearm length from elbow to fingertip. Other human based units included are fathom and span along with a bunch of other ways of measuring things with your body that we find useful.
The poster is available in their CW&T store.