Slide projection

Projection of photographic images onto a screen. Becoming a very sophisticated art, using coordinated tape recorded "sound tracks", several screens, and several projectors simultaneously.[Advantages]

Surprisingly effective process for illustrating a talk or making a point. Relatively low costs involved in making up the "show" and in presenting it. Photography is still a powerful medium for communicating atmosphere and ideas inspite of video, films and other cinematic processes.

[Disadvantages]

Can tend to define rather than illustrate a talk.