INTERNAL ILLUMINATION
3D printing is known for its ability to precisely fabricate the outer form of physical objects and has been used to create
a variety of unique displays. Optically clear material allows for the design and fabrication of inner forms
within a 3D printed model. Internal structures can be viewed from the outside and highlighted with illumination. Internal
illumination can be used with interactive devices to display information ranging from simple indicators to complex
volumetric displays. In this section of the paper we introduce techniques for internal illumination by creating reflective
pockets of air within a solid transparent model.