Either by magic or trick of memory, author/illustrator Peter Sis is transported to the Prague of his childhood. As in all of Sis's books, the imaginary gets mixed up with the real -- in this book, he meets characters from Czech folklore, including the Golem and Hanus the Clockmaker. Prague, so often called a "fairy tale city," is at its most fairy tale-ish in this sophisticated, entrancing picture book. Intended for grade-school children, the book will appeal equally (or more) to parents.  (CZH39, $23.00)