Nasty or just plain nuts? E.g., "In one experiment, to prove that colour perception is caused by pressure on the eye, Newton slid a darning needle around the side of his eye until he could poke at its rear side, dispassionately noting 'white, darke & coloured circles' so long as he kept stirring with 'ye bodkin.'" <http://en.wikipedia.org/wiki/Isaac_Newton's_middle_years>
Odd's bodkin so to speak.
Carl
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