"Über das Geistige in der Kunst, Insbesondere in der Malerei" by Wassily Kandinsky is a treatise published in Munich in 1911. This foundational text on abstract art explores the spiritual dimension of artistic creation, arguing that art's true essence lies beyond material representation. Kandinsky develops a theory where color and form become vehicles for emotional and spiritual expression rather than mere depictions of nature. Through this work, he establishes principles that would guide modern abstract painting, proposing that artists must seek inner truth and transcend materialism to create authentic spiritual art.