If you took The Cartesian Journey, you doubted all that you see. Nothing that you see has necessarily anything to do with reality. This is true in a physical sense: you can never be sure that what you see actually physically happens. But it is also true in a more intellectual sense: you perceive the world according to your worldview. So, although you may perceive the same things as somebody else, you may interpret them differently.
These are your rose tinted glasses. The ideological filter through which you see the world. You can never put them off. You can, however, try to put on somebody else’s glasses from time to time. Try to view the world through a different filter.