2 paintingscreatedusingthismethodarecalledPointillistpaintingsAnotherexampleofaPointillistpaintingbyPaulSignacisshowninthenext gureHedistributeddotsofprimarycolorsinapatternonthepaperanddepen ID: 399174
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2 FIG.3:"PortSt.Tropez":aPointillistpaintingbyFrenchpainterPaulSignac. paintingscreatedusingthismethodarecalled"Pointil-list"paintings.AnotherexampleofaPointillistpaint-ingbyPaulSignacisshowninthenextgure.Hedis-tributeddotsofprimarycolorsinapatternonthepa-per,anddependingonthequantityofacertaindotinaspecicarea,aspeciccolorisseenbytheviewer.ThePointillistpainterswiththeirdotpaintings,thusconrmedthecolortheoriesofphysicistslikeNewton,Young,Helmholtz,andMaxwell.Modernnewsprintingusesthesametechniquestopro-ducecolors.IfyouuseamagnifyingglasstolookverycloselyatthecartoonsectionofyourSundaynewspaper,you'llndthattherainbowofcolorsyouseeisactuallymadeupoftinybitsofjustafewcolors.Whenyoubackupandlookfromadistance,thebitsappeartoblendto-gethertoformvariedcolorsandtonesagain.Thisthenisopticalmixing:blendingthattakesplaceintheviewer'seyeratherthanonthepageorthecanvas.Manyexamplesofcolorillusionshavebeendiscoveredbyotherpeopleaswell.In1894,Mr.C.E.Benhamatoymaker,discoveredthataspinningdiskwithapartic-ularpatternofblackandwhitemarkscouldcausepeopletoseecolorswheretherewerenone!Benham'sSpinningTophaspuzzledscientistsforovera100years,andmanytheorieshavebeenformedtoexplainit.Onetheorysaysthattheblackandwhitepatternappearstohavecoloredringsbecausethedi erentcolorreceptorsinyoureyesrespondatdi erentrates.However,justwhypeopleseecolorswhenthediskspinsisstillanunresolvedquestionandtohavefunwithit,trymakingyourownillusiontoy,byfollowingtheproceduregivenbelow! 1. GetanoldCDoraround,plasticlid(ofabiscuittinforexample).Heata25PaisecoinandinsertithalfwayintothecenteroftheCDholesothatthecoinisper-pendiculartotheCD.ThehotcoinwillmelttwoslotsoneachsideofthecenterCDholeandwillstickinthemiddleoftheCDwhenitcoolsdown.Alternatively, FIG.4:BlackandwhitepatternonBenham'sdisk. pokeaverysmallholeinthemiddleoftheplasticlidandstickamatchstickortoothpickhalfwaythroughit.Yourspinnerisnowready-twistthecoin(orthetoothpick)tospinthespinner. 2. Printordrawtheblackandwhitepatternsshowninthegure,ontoasheetofpaperandcutitoutinacircularshape.Makeasmallslitinthecenterofthecircularpatternandtthepaperontothecoinortoothpicksothatthepatternlies atontheCD(orplastic)spinner. 3. Spinthespinnerinsunlightandseeifyoucanobservethecolors! 4. Changetheconditionsoftheexperiment:spinthespin-nerclockwiseandthenanticlockwise,changethelight-ingfromsunlightto uorescent,andmakeyourownpatternusingablackpentodrawaseriesofarcs.Recordyourresultsandreachyourownconclusions.