Interaction of color by Joseph Albers
Just downloaded 'Interaction of Color' by Josef Albers , a new IPad app for $9.99. I would say as a painter trying to learn composition and design principles, this book is an absolute must. My paintings will definitely include newer design elements because of this application. Its a lot more interesting than reading the book. The interactive plates in this app are the most fun part. Try the free preview app before you buy the full version .