Everything We Know About Bill Cipher's Past So Far

Everything we know about Bill Cipher's past so far

His home was called Euclydia and it was entirely two dimensional. ("Flat minds in a flat world with flat dreams.")

Bill was unique among his people because he had a mutation that allowed him to see the third dimension. This can mean that either a) Euclideans don't have eyes and Bill is the only one who had one or b) if they did have eyes, he literally had a third eye.

Bill's parents were most likely named Scalene and Euclid. Entering either of their names into the computer gives the prompt LIFE FORM NOT FOUND. Bill is stated to only draw red and blue triangles in art therapy, so those were probably their appearances.

From the code JUSTFITIN, you get this colour-coded poem:

Rock a bye billy Please don’t you cry It’s not your fault You have that strange eye Stay safe with mommy You’ll never fall And we’ll always love you Sharp angles and all

Bill says that everyone in Euclydia loved him. However, it's more likely that he was feared because of his mutation and talk of a third dimension. Bill has said numerous times that love and fear are the same, and if you enter WELLWELLWELLBEING into the computer:

Bill's parents took him to a doctor to help suppress his vision of the third dimension. This has been discovered through the codes on the silly straw page:

Fussy eater, baby Billy / Wouldn't drink unless it's silly The doctor says three sips a day / Will make the visions go away Eye doctor of a different kind / Who wants to make his patient blind Twisted out of shape after the kill / The ghosts of his family are haunting him still

Bill is responsible for the Euclidean massacre. Reversed audio on the website says that "the sky is on fire", and when Bill talks about liberating his dimension, his eye shows a fiery landscape too. Though he claims to have liberated them both in Weirdmageddon and the transmission with Time Baby, he is regretful and misses home. If you type in EVENHISLIESARELIES, you get a transcript of one of his sessions in the theraprism.

And from the axolotl's poem in Curse of the Time Pirate's Treasure:

When he tells Ford about his home dimension, he says that it was destroyed by a monster. And when Ford says that he could seek out the monster and get revenge on it, Bill replies: "Sixer, it would eat you alive." Bill also says that if he tries to talk about the day Euclydia was destroyed, there's a loud buzzing in his ears and he blacks out for 30 seconds. Still, he tells others that he freed everyone and that they are grateful for it. Until he gets drunk and starts calling out for his mom, asking her where she went...