Andy Parkinson Knihy

This book is a collection of intriguing mathematical challenges that come from folding paper. All the challenges are the same, fold the corner of the paper to a given dot and find the area that remains uncovered. Despite the same question, a small move of the target dot can drastically change the logic needed to find the solution to the challenge. So the problems become increasingly complex, with possible solutions involving Pythagoras' and similar triangles as well as trigonometry and algebra. Insights learnt from earlier challenges can help with those that follow. However, if at point the challenge becomes too great, the answers can always be found by measurement with a ruler and directly calculating the area. The book encourages curiosity, a "find out what can you" discovery approach that creates interesting and varied journeys towards a solution. Starting with an approximate guess, these journeys are for all ages (10 years and over) to explore and discuss. To play concretely with paper while thinking and reasoning geometrically. Thus, for teachers the book provides a rich source of challenges that have a similar appearance, yet hide an obvious method and require students to choose how to approach the problem. Comparing solution methods when checking the answers is also useful as the solutions highlight some fascinating facts linked with these simple folds.

This comprehensive, beautiful book delves deep into the complex but fascinating story of our relationship with colour throughout human history.Color is fundamental to our experience and understanding of the world. It crosses continents and cultures, disciplines and decades. It is used to convey information and knowledge, to evoke mood, and to inspire emotion.This book explores the history of our understanding of color, from the ancient world to the present, from Aristotle to Albers. Interspersed in the historical story are numerous thematic essays that look at how color has been used across a wide range of disciplines and in food, music, language and many others.  The illustrations are drawn from the Royal College of Art’s renowned Colour Reference Library which spans six centuries of works and nearly 2,000 titles, from a Gothic manuscript on the composition of the rainbow to hand-painted Enlightenment works on color theory and vibrant 20th-century color charts, including many fascinating examples not  seen in other books.Delving far and wide in this fascinating and varied subject, this book will help readers find new layers of meaning and complexity in their everyday experiences and teach them to look closer at our colorful lives.