Answer
Hans Arp, a fellow Dada artist and close friend of Janco's, marked the end of their Dada collaboration in 1919. Their divergence stemmed from differing artistic visions, with Janco prioritizing abstraction while Arp leaned towards a more organic and biomorphic style. Despite this parting of ways, both Janco and Arp remained influential figures within the broader Dada movement, shaping its legacy and impact on the art world.