Need some black/white gratings, too... (The link to the article has them, but having some here would save having to leave here to get it.)
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Try it.
http://www.iflscience.com/brain/image-can-break-your-brain
The McCollough effect is a phenomenon of human visual perception in which colorless gratings appear coloredcontingent on the orientation of the gratings. It is an aftereffect requiring a period of induction to produce it. For example, if someone alternately looks at a red horizontal grating and a green vertical grating for a few minutes, a black-and-white horizontal grating will then look greenish and a black-and-white vertical grating will then look pinkish. The effect is remarkable for often lasting an hour or more, and in some cases after prolonged exposure to the grids, the effect can last up to three and a half months.
"after prolonged exposure to the grids, the effect can last up to three and a half months." - TRY IT
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