Fun with illusions:

Thomas explained the difference between science and the sort of pseudoscience frequently debunked by the group this way:
Science, he said, looks at all of the available evidence and tries to come up with some sort of overarching explanation that explains it all. Scientists call them “theories,” but when they use the word, they mean a well-established idea: the theory of relativity, the theory of quantum mechanics, the theory of continental drift, the theory of evolution.
Pseudoscience does the opposite.
“They start out with a belief and then they cherry-pick the data to find little nuggets that support that belief,” he said.