TY  - BOOK
AU  - Baum,Arline
AU  - Baum,Joseph
TI  - Opt: an illusionary tale 
T2  - Picture puffins
SN  - 0140505733
AV  - PZ7.B3267 Op 1989
U1  - [E] 19
PY  - 1989///, c1987
CY  - New York, N.Y., U.S.A.
PB  - Puffin Books
KW  - Optical illusions
KW  - Fiction
N2  - A royal family and court present a variety of optical illusions which are explained at the end of the book. Includes some suggestions for making your own illusions
UR  - http://www.archive.org/details/optillusionaryta00baum
UR  - http://www.openlibrary.org/books/OL2051080M
ER  -