I take no responsibility for absolutely anything that comes about use of this app. If you download and use it, you are solely responsible for it.
This is a .NET C# app which is intended for the induction of the McCollough Effect.
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"The McCollough effect is a phenomenon of human visual perception in which colorless gratings appear colored contingent 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 3.5 months."