Emmett Leith and Juris Upatneiks published several papers on holography (a technique for making three-dimensional, viewable images) between 1961 and 1964. However, it wasn't until they showed a toy-train hologram to hundreds of attendees waiting in line at the April 1964 Optical Society of America meeting that the scientific community got excited over holography's potential.
-- From Center for Innovation Management Studies, North Carolina State University (link: @)
-- Image from MIT Museum (more images: @)
* "Wavefront Reconstruction with Diffused Illumination and Three-Dimensional Objects" (Leith and Upatneiks, Journal of the Optical Society of America, November 1964): @
* Oral history with Leith (from American Institute of Physics): @
* "Holographic Visions: A History of New Science" (Sean Johnston, 2006): @