Klecksographs by Justinus Kerner:

Klecksography is the art of making images from inkblots. The work was pioneered by Justinus Kerner, who included klecksographs in his books of poetry. Since the 1890s, psychologists have used it as a tool for studying the subconscious, most famously Hermann Rorschach in his Rorschach inkblot test.