Bird/Ptak is a character in Smile Guide that has the unique distinction of being both a visible and invisible character.
Bird's image is evoked through the following quotes, from writer Zofia Kopytlanka:
"Only in a toy-plane, you can truly fly."
"Birds grow weary of flying, like people of walking."
Bird makes its "swan song" or singular appearance in "SMILE GUIDE: THE APPLE ESCAPE" game, in the secret level 'korytarz'.
Since bird is both a visible and invisible character, bird's role is helpful to remind us to go back and watch the series, with the 4 most popular ARG perspective theories in mind. (See also "Theories")