It took me a long time to discover that particularities of form and natural colour evoke subjective states of feeling which obscure pure reality. The appearance of natural forms changes, but reality remains. To create pure reality plasticity, it is necessary to reduce natural forms to constant elements of form, and natural colour to primary colour. The aim is not to create other particular forms and colours, with all their limitations, but to work toward abolishing them in the interest of a larger unity.