There is an optical illusion about every person we meet.

The greatest optical illusion of all is to believe that an image has only one interpretation.

Our separation from each other is an optical illusion.

Human beings have a kind of optical illusion, Einstein once said. We think ourselves separate rather than part of the whole. This imprisons our affection to those few nearest us.

Crowds create illusions.

What if there are other optical illusions about our existence that are just as major as the illusion of the Sun revolving around the Earth? [...] What are the odds that you live in exactly the window of human existence when all of the major optical illusions have been discovered? Wouldn't that be an amazing coincidence, since every previous generation of humans has believed they were born in that window of time?

Who is truly anyone? Every person is illusion to some degree.

Everyone is mistaken, everyone lives in illusion. At best, we can admit a scale of fictions, a hierarchy of unrealities, giving preference to one rather than to another; but to choose, no, definitely not that...

In fact, the whole idea of illusion seems to make sense only if we accept the reality of the illusory experience as an experience and question only what it seems to be telling us about the outside world. Optical illusions do really hapen. What they can’t do is provide accurate measurements of the outside world. The idea of having, so to speak, two successive layers of illusion here is unworkable.

"That wall," explained the Shaggy Man, "is what is called an optical illusion. It is quite real while you have your eyes open, but if you are not looking at it the barrier doesn't exist at all. It's the same way with many other evils in life; they seem to exist, and yet it's all seeming and not true."

"That wall," explained the Shaggy Man, "is what is called an optical illusion. It is quite real while you have your eyes open, but if you are not looking at it the barrier doesn't exist at all. It's the same way with many other evils in life; they"

In a vivid insight, a flash of black lightning, he saw that all life was parallel: that evolution was not vertical, ascending to a perfection, but horizontal. Time was a great fallacy; existence was without history, was always now, was always this being caught in the same fiendish machine. All those painted screens erected by man to shut out reality - history, religion, duty, social position, all were illusions, mere opium fantasies.
- The French Lieutenant's Woman

Any individual entity that pretends to understand the rules that guide this space is under an illusion.

Every perception of colour is an illusion.. ..we do not see colours as they really are. In our perception they alter one another.