I reflect on the various paths that led to holography, along with various other paths that could have led to holography. Also discussed is how holography, while maintaining a central core, exemplified by display holography, has expanded in scope and has diffused into vast areas of modern technology; in the process, the boundaries between holography and non holography have been blurred.
Emmett N. Leith, Emmett N. Leith,
"Reflections on the origin and subsequent course of holography", Proc. SPIE 5005, Practical Holography XVII and Holographic Materials IX, (4 June 2003); doi: 10.1117/12.478429; https://doi.org/10.1117/12.478429