Virtual reality is the new reality. Woah.

Michael Abrash, the chief scientist for Facebook’s Oculus, took the stage during day two of the F8 Developer Conference in San Francisco to blow everyone’s mind with some trippy optical illusions.

During the keynote, Abrash highlighted some interesting illusions to explain how we can trick our eyes into thinking what we’re seeing is reality. And according to Abrash, these perceptions, and the assumptions our brain makes about them, are what make virtual reality work.