Instruct: Classify a review as either positive or negative.
Query: theory and praxis

This slim book is a superlative endeavor for the nascent artist who wishes to grok the tantalizing, intriguing and intricate creations of M. C. Escher's uniquely perceptive intellectual faculties. Do have ample fine- to medium-tipped pencils of several colors at your ready. Also. engage your answering machine to thwart interruption of your artistic pursuits.