A lighting designer combines a red spotlight and a green spotlight so their beams overlap on a white stage floor. What color appears in the overlapping area?
ABrown, because mixing two colors together always produces a muddied result
BYellow, because red and green light mix additively to stimulate color receptors in a new combination
CBlack, because combining colors absorbs wavelengths and produces darkness
DOrange, because red and green are adjacent on the color wheel
This is the classic counterintuitive result of additive color mixing. Red and green light combined produce yellow — not because of any artistic color wheel, but because the eye's color receptors respond to the combined wavelengths in a way that we perceive as yellow. Additive mixing always moves toward white (all wavelengths present), not toward black. Option C is the pigment-mixing instinct applied incorrectly to light.
Question 2 Multiple Choice
Why does mixing all pigment colors together produce a dark, muddy result rather than white?
ABecause pigments are impure and real-world mixing always introduces contamination
BBecause pigment mixing is subtractive — each pigment absorbs more wavelengths, so the combined mixture reflects very little light back to the eye
CBecause the RYB color wheel has different primaries than RGB, so full-spectrum mixing behaves differently
DBecause pigments are denser than light and cannot combine at full intensity
Each pigment works by absorbing (subtracting) certain wavelengths and reflecting others. A red pigment absorbs non-red wavelengths; a blue pigment absorbs non-blue wavelengths. When mixed, they absorb each other's reflected wavelengths, leaving very little light to reflect back — the result is dark and approaching black. More pigments = more absorption = darker result. This is the opposite of light mixing, where more = brighter.
Question 3 True / False
Diagonal lines in a composition feel more dynamic than horizontal lines because they suggest instability and implied motion to viewers.
TTrue
FFalse
Answer: True
This question tests understanding of line direction energy as described in composition principles. Horizontal lines echo the ground and a body at rest — they feel stable. Diagonal lines are neither resting nor standing; they imply falling or rising, which our visual system reads as motion. This is why value (in color) and direction (in line) both communicate kinetic or emotional content independent of subject matter.
Question 4 True / False
The primary colors for mixing light (RGB) are the same as the primary colors for mixing paint (RYB).
TTrue
FFalse
Answer: False
Additive (light) primaries are red, green, and blue (RGB). Subtractive (pigment) primaries are traditionally red, yellow, and blue (RYB) in painting, or more precisely cyan, magenta, and yellow (CMY) in printing. These systems are different because they operate on opposite physical principles — adding light versus subtracting wavelengths. Confusing the two systems is one of the most common errors when moving between screen design and print or paint.
Question 5 Short Answer
Explain why combining all colors of light produces white, while combining all pigment colors produces black (or near-black).
Think about your answer, then reveal below.
Model answer: Light mixing is additive: each color adds more wavelengths to the mix, so combining all of them produces the full visible spectrum, which we perceive as white. Pigment mixing is subtractive: each pigment absorbs (removes) wavelengths rather than adding them. Combining all pigments means every wavelength is absorbed by some pigment, leaving almost no light reflected back — which we perceive as black.
The underlying mechanism determines the result. A screen emits light, so combining all channels adds energy. A pigment reflects light, so each added pigment reduces what reflects. This is why the same intuition (mix everything = neutral) produces opposite results in the two systems, and why an artist mixing paints and a screen designer mixing RGB colors must think about color completely differently.