A treatise of painting . lis the clofc r0ffonows, from what we have already fhewn,the Day, ap-i^. That the Surface of every Opake Bodypear Azure, partakes of the Colour of its Object *, whence,the Whiteoefs of the Wall, being altogetherdeftitute of Colour, muft aifume thofe of itsObjects, which, in this Cafe, arc the Sun, andthe Heavens: and fince the Sun in his EveningsVilit to the Horizon, appears Rcctdifh, and theHeavens Azure \ And lificc thofe Places wherethe Shadows are found, are out of the reach ofthe Sun •, we having elfewhcre proved, that naluminous Body has ever iccn the Shadow of a
A treatise of painting . lis the clofc r0ffonows, from what we have already fhewn,the Day, ap-i^. That the Surface of every Opake Bodypear Azure, partakes of the Colour of its Object *, whence,the Whiteoefs of the Wall, being altogetherdeftitute of Colour, muft aifume thofe of itsObjects, which, in this Cafe, arc the Sun, andthe Heavens: and fince the Sun in his EveningsVilit to the Horizon, appears Rcctdifh, and theHeavens Azure \ And lificc thofe Places wherethe Shadows are found, are out of the reach ofthe Sun •, we having elfewhcre proved, that naluminous Body has ever iccn the Shadow of anyBody illuminated by it ^ Tis Obvious, that theShadow of the Heavens, -projected on theWhite Wall, will appear Azure; and further,,that the Ground of that Shadow, being illuminedby the Sun, win appear Reddifh, in Conformi-ty to the Rednefs of its I ,u mi Smoke/ That Smoke, which is mtcrpofed bctWTcnthe Sun, and. rhc Eve thru- fees it, mnlT appearghterand more Trunfpavent, than the Smoke fecn /?•, ^Leonardo da ViNcr. 167 fcen in any other part of the Painting : Thefame thine, may be obferved of Dull, Fog, andother like Bodies- which ought always to appearobfeure, when you are placed between them andthe Sun. Smoke is more tranfparcnt, and of a Colourlefs deep towards the Extremes of its Mailes>than in the Centre, and towards the Middle. Smoke rifes more obliquely, as the Windwhich drives it is more ftrong, and violent. Smoke, appears under as many different Co-lours, as there are different Caufes to pro-duce it. Smoke, never projects any Shadows that arebold and defined \ and its Extremes weaken bylittle and little} becoming infenfible, as it re-moves further from its Origin : Thofe Objects,which are feen through it, appear fo much thelefs feniible, as it is more Denfe *, and it is foundfo much the Whiter, as it is nearer its Principle,and the more Blueifh, as it is further removed. Fire appears more obfeure, as there is a grea-ter quantity of Smoke, fo
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Keywords: ., bookauthorleonardodavinci14521519, bookdeca, booksubjectpainting
