The Nature series consists of four books: Art of Nature, Shades of Nature, Reflection and now Moods of Nature. This book has evolved many times since its conception, as Heinrich's moods changed. It started full of colour, but in the end the only colour that remained was the mood colour of nature - the colour of sunsets. The book was printed using two diverse printing processes: Sepiana for black and white and Chroma Centric for the colour images. The Sepiana process uses four grey and black inks to print, and Chroma Centric employs a special. technique to enlarge the gamut of the colour it can print.