Described by one observer as "strangely alive" and similar to a "giant alien maggot," the trunk/Doc Ock arms were created with 3D-printed segments and connected by pneumatic artifical muscles... it also has artificial intelligence and muscle memory! It's programmed to learn in much the same way a human baby does – through a process of trial and error. Called "goal babbling," the robot trunk can attempt to grab something; remember what went wrong; make tiny adjustments in its own positioning and muscle behaviour; and then try the grab again, until it finally gets it right.