IAL 6: Specials: From Playlist for Group Activities:

1. P-list: Glass Armonica: Dance of the Sugar Plum Fairy | 3:26: The glass armonica was invented by none other than Benjamin Franklin (1706--1790). Here used for Pyotr Ilyich Tchaikovsky's (1840--1893) Dance of the Sugar Plum Fairy. Jump to 20 to see the glass armonica itself.
2. P-list: Glass harp-Toccata and fugue in D minor-Bach-BWV 565 | 7:20: Low key, but interesting in a shallow kind of way. Skip 00:10 and then a minute or so OK for the classroom.
3. P-list: Pinna illusion | 0:00: See the caption at Wikimedia Commons: Pinna illusion and the article at Scholarpedia: Pinna illusion. Which way does the spiral spiral in?
4. P-list: Regenbogen | 2:22: By Annett. For lyrics see version 2.
5. P-list: Spinning Dancer | ∞: Either way--the usual cues have been omitted and the mind decides. You can make her reverse by looking at the shadow of her feet. See the caption at Wikimedia Commons: Spinning Dancer and the article at Wikipedia: Spinning Dancer.
6. P-list: To Anacreon in Heaven | 2:25: Elegant version. See Wikipedia: To Anacreaon in Heaven and the rowdy version 2.