The Paul Mask is a mask of Paul's face made by Carl after Paul left as a replacement. It is first seen in Episode 7, being worn by a sheep Carl got to replace Paul.
The Paul mask is first seen in episode 7, being worn by a sheep, used by Carl as a replacement for Paul. Carl refuses to let the sheep take the mask off, because "it has to look right" when Carl throws the sheep into his blood canal.
After Carl kills the sheep he begins to speak to the Paul mask until it comes to life. The mask as a robotic voice and it tells Carl to finish his work.