- Incredible Moiré Patterns! (youtube.com)
Sir Roger Penrose demonstrates the extraordinary moiré patterns produced by overlaying and rotating two identical, repeating patterns. As the two patterns overlapped and rotated they interfere with each other to produce tertiary patterns.
- Madison, Georgia (Wikipedia)
Madison is a city in Morgan County, Georgia, United States. It is part of the Atlanta-Athens-Clarke-Sandy Springs combined statistical area. The population was 4,447 at the 2020 census, up from 3,979 in 2010. The city is the county seat of Morgan County and the site of the Morgan County Courthouse.