Final answer:
The shapes of Schult's trash people make them seem like human beings.
Step-by-step explanation:
The trash people created by Schult make them seem like human beings primarily through how they are shaped. The physical form of the sculptures, resembling humans, helps viewers to empathize with them and see them as more than just trash. The unique shapes and poses of the sculptures evoke emotions and create a connection with the viewers, making them perceive the trash people as living beings.