AttentioninvisionissomethingthatIthinkhasfascinatedmesincemyundergraduatedaysattheUniversityofToronto.ThatisprettysurprisingbecauseIwenttouniversitywantingtobeanaerospaceengineerormaybeaphysicist.Inmyfirstyear,IsubscribedtoScientificAmerican,andin1971twopaperscaughtmyfancy:“