Lindelof described Walt's abilities as "mythological magic," writing that he "had these kind of psychic abilities in a Stephen King kind of way. Birds are smashing into windows, and we are calling an episode 'Special'."[1] According to writer Nikki Stafford, two situations imply Walt summons animals – he causes a bird to fly into a window while reading a book on birds, and he makes a polar bear attack him after reading a comic book about such a bear.[8] The polar bear was mostly depicted through computer generated imagery, with an animatronic head and puppeteers wearing bear arms being used for close-ups.[3]