There are three types of illusion: the illusion of human favorable, no effect on the people of the illusion, the illusion harmful to people. Harmful to people the illusion interfere with human judgment, people make the wrong decisions; beneficial to people the illusion of people motivated and motivating.
White lies is beneficial illusion.
Lying on the grass watching clouds, clouds the mind as the shape of an animal; watching the kaleidoscope, the findings imagine many scenarios. It will be awarded by imagining yourself fun, and this is advantageous illusion.
Judge true and false, good or bad, whether it needs to be judged according to their advantage.