In each phase, participants are in Virtual Reality. They are handed a Vive controller with a fork attached, and there is a grape on the fork. They see the controller, the fork, and the grape in Virtual Reality.
The participant's task is to eat the grape. However, the fork they see on the Vive may not be exactly where the fork is in real life. This leads to some hilarious results.
Phase 1: Normal Participants see the fork in VR at the same position as it is in real life.
Phase 2: Translation Participants see the fork in VR about an inch to the left of where it is in real life. This causes them to miss their faces.
Phase 3: Depth Participants see the fork in VR as being closer to them than it actually is. This causes them to be confused when the grape never enters their mouth
Phase 4: Flavor Participants eat the grape, but the grape isn't actually a grape, it's a sour candy.