This visualization created by Jennifer Payne and inspired by Samuel Huron's visual sedimentation was created from gumballs, an acrylic (plexiglass) box and adjustable foamcore bin dividers. Huron's work is inspired by the physical process of sedimentation.
The above figures illustrate a participatory representation of hours of sleep for a university population, with different colours of gumballs representing different groups present on a university campus (i.e. blue gumballs for graduate students, violet gumballs for faculty etc.).
Source: Huron, S., Vuillemot, R., & Fekete, J. D. (2013). Visual sedimentation. In IEEE Transactions on Visualization and Computer Graphics, 19(12), 2446-2455.