- 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.
- Israel in Egypt (Wikipedia)
Israel in Egypt, HWV 54, is a biblical oratorio by the composer George Frideric Handel. Most scholars believe the libretto was prepared by Charles Jennens, who also compiled the biblical texts for Handel’s Messiah. It is composed entirely of selected passages from the Old Testament, mainly from Exodus and the Psalms.