In life, we deal with illusions in more ways than one. Some people are too afraid to question their illusions in fear of leaving what they deem as a comfortable life. For others, they refuse in believing in something unless evidence is provided, which is the mark of a rational mind.
The following picture is that of
two perfectly round circles. There is an illusion that this is false,
but with some evidence we can see that the illusion is only meant to
trick our minds into believing something that it's true. Question
everything, only believe something after you have rationalized it.