He combined and synthesized various animation techniques he had learned over his career and developed new ones such as blurring back - lit images with soap .
Masereel found animation work tedious and backed out partway through ; Bartosch finished the production in mid-1932 .
Bartosch combined and synthesized various animation techniques Bartosch had learned over Bartosch 's career and developed new ones such as blurring back - lit images with soap .
Masereel found animation work tedious and backed out partway through ; Bartosch finished the production in mid-1932 .