Brain in Jar Character from the first trailer Spoiler possibly.

[1minus1is0]

I like to head-canon it this way: That scene takes place hundreds of years in the future after WAU has terraformed the earth, and the whole room is a construction intended to ease a newly created persona into its new life so it doesn't go nuts. Kind of like artificially replicating Simon's experience to produce a more stable persona in the end. The means of doing so seem like something an unstable non-human AI would do.