He describes some entertaining peep-show arrangements, possibly similar to Alberti's, and indicates how the dark chamber with a concave speculum can be used for observing eclipses.
Apparently, since the invasion of the US and the subsequent death of Saddam Hussein, peep show cinemas, which were not allowed previously, are springing up everywhere.
All of these styles are very sexy, but after you see the Peep Show Babydoll with Matching G-String, you may think that it's the sexist of them all.
Here, the Chiffon Open Cup Babydoll and Thong is not quite as sheer as the Peep Show look, and further, the color is solid purple, not a mix of purple and black.
That said, note that the large ribbons of the Peep Show number are also present in the Chiffon style.