In the puzzle game "Baba is you", three word sentences define the rules of the game. For example the phrase in the title means that the character/object "baba" is controlled by the player.
You can use phrases of the form "<noun> is <other noun>" to transmute objects. But of there is the phrase "<noun> is <same noun>" on the board, then it becomes immutable, matching the use or repetition described in the article. For example https://i.postimg.cc/Z0kqQxXY/image.png
