vanishing point- A vanishing point is a point on the image plane of a perspective drawing where the two-dimensional perspective projections (or drawings) of mutually parallel lines in three-dimensional space appear to converge.
orthogonal- elating to or involving lines that are perpendicular or that form right angles, as in This design incorporates many orthogonal elements. Another word for this is orthographic. When lines are perpendicular, they intersect or meet to form a right angle.
picture plane- in perspective, the imaginary plane corresponding to the surface of a picture, perpendicular to the viewer's line of sight.
the difference between light and color is that light is energy made up of wavelengths, whereas colors are the various wavelengths our eyes are sensitive to and can see once the light is reflected from or emitted from matter.
I honestly have no clue if I'm correct. My guess is based on the knowledge that impressionist artists usually tried to capture feeling in their paintings rather than a concrete subject. There's no right or wrong way to feel.
Wait for someone else's answer to confirm this. Hopefully I got it right.
