Also known as 'Value drawing'. Drawing without using line and depending purely on tone, and interpeting what you see in terms of tonal values and textures. Includes many different methods.
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...what a book! It only took me 3 hours to put it down, that's only because I realised that my coffee was stone cold!! This book will generate a whole generation of artists, and they'll be able to draw too. I've been drawing and painting for over 25 years and this book is without equal, nothing I've ever read, viewed or dreamed about comes close.