hand planes
crocheting adventures with hyperbolic planes
p winner of the euler book prize awarded by the mathematical association of america p with more than 200 full color photographs this non traditional tactile introduction to non euclidean geometries also covers early development of geometry and connections between geometry art nature and sciences . for the crafter or would be crafter there are detailed instructions for how to crochet various geometric models and how to use them in explorations . p from the foreword by william thurston p these models have a fascination far beyond their visual appearance . as illustrated in the book there is actually negative curvature and hyperbolic geometry all around us but people generally see it without seeing it . you will develop an entirely new understanding by actually following the simple instructions and crocheting the models are deceptively interesting . perhaps you will come up with your own variations and ideas . in any case i hope this book gives you pause for thought and changes your way of thinking about mathematics .