Main Page | See live article | Alphabetical index A Single Image Random Dot Stereogram (SIRDS) is a stereogram composed of (coloured) dots which when viewed correctly appears three-dimensional. SIRDs were invented by Dr. Christoper Tyler, Associate Director of the Smith-Kettlewell Eye Research Institute in San Francisco. This article was originally based on material from FOLDOC, used with permission. Update as needed. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.