Tzara would draw [during Dada-evenings in Zürich, Switzerland] slips of paper with words described on them from a hat, and present the resulting combination of words as a poem. Arp allowed cut-outs of free or geometric shapes to arrange themselves in a random order, then pasted them on a surface and presented the result as a picture. In the course of such experiments Arp also used 'automatic writing', i.e.: irrational, spontaneously traced forms, rising from the unconsciousness.
Jean Arp