Blake believed the paintings of Sir Joshua Reynolds, which depict the naturalistic fall of light upon objects, were products entirely of the "vegetative eye", and he saw Locke and Newton as "the true progenitors of Sir Joshua Reynolds' aesthetic". The popular taste in the England of that time for such paintings was satisfied with mezzotints, prints produced by a process that created an image from thousands of tiny dots upon the page. Blake saw an analogy between this and Newton's particle theory of light. Accordingly, Blake never used the technique, opting rather to develop a method of engraving purely in fluid line, insisting that: