From - The Matrix
From the disc's main menu go to the Special Features and there select The Dream World.
Apart from the text menu entries you will also see a red pill.
Select it and you will be taken to the What Is Bullet Time? documentary.
Also in the Special Features section go to Cast & Crew Bios and there select the
This will bring up another red pill.
Select it and it takes you to a 12- minute documentary called What Is Concept?