Have you seen my brush?

addendum 2015 March 25:

DSC_2113LeanLeftBGBrush2

It feels similar to viewing sterographic pairs: difficult at first, but once your mind/eyes recognise what to look for it becomes much easier. Seeking out the brush can help treat strabismus, teaching the looker to look with their macula. [1]

haidingersBrush

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