Ethan Flask is teaching his sixth-grade science class about optical illusions, and other people in the school are seeing things.
- ISBN10 0613817192
- ISBN13 9780613817196
- Publish Date 1 August 2002
- Publish Status Out of Print
- Out of Print 8 February 2021
- Imprint Turtleback Books
- Edition Turtleback School & Library ed.
- Format Hardcover (Library Binding)
- Language English