Die Chromatika/The Chromatika, Eine psychologische Farbenlehre für das 21. Jahrhundert/A psychological theory of colour for the 21st Century. Perfect bound book, 190 x 235mm, colour, 234 pages, ISBN 978-1912622320, published by Martin Firrell Company, 1 July 2021, London UK. Photographed by the artist, 23 May 2021.