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altitude angle appearances of nature artist ascer ascertained building centre Circular Vision circumference cognizant vision column concave convexity cornea curvilinear perspective demonstrated distance distortion drawing drawn evident figure fixed given relative proportion govern ground-plan horizontal line intersecting points laws limit of vision line passing linear perspective lines of nature lines parallel look magnitude Malton object obtain optic nerve organ parallel plane passing the eye perfect vision perpendicular to vision perspective depth perspective inclination perspective of nature picture plane passing planes and lines portion position principle of vision principles of rectilinear produce radius recede rectilinear perspective refraction retina right line right-lined perspective seen sensorium shew shewn side space spectator sphere station straight line strata surface terminate Theorem theory tion towers transparent plane truth vanishing plane vanishing points vanishing-line vanishing-point vertical lines vision is cast visual rays vitreous humour XVII
Pagina 75 - His belief that he can portray the 'appearance of nature to the eye' is founded on the premise that 'as far as the eye is concerned, we live in the centre of an immense globe, which has reference only to that organ, having the visible horizon and the arch of space described by the radius of the eye to that horizon, for its limit'.14'* Herdman emphasises that the 'visual globe...