1. Harmonious colours: Painted a series of 5 small primary yellow squares along the top of the grey paper from left to right.
then surrounded them with yellow/green, green/yellow, yellow/orange, orange/yellow and red/orange.
2.Complementary colours: Two colours which are tertiary colours - inside yellow/green (brightest) inside square and outside - red/violet, and visa versa, cause one another to appear more vibrant. My eyes seem to jump from one to another. The yellow/green being more saturated than its complementary with white added is more intense.
3. Inside square beige (neutral), outside - 1.orange, 2. blue. The same effect here as no.2. I don't know why - the white frame around the neutral beige appears to anchor the two complementaries above it. The neutral, even seems to be in turn enhanced by the saturated colours. This beige and the surrounding grey ground cause the white frame to appear vibrant.
Harmonious colours (those close on the colour wheel or spectrum) modify one another when juxtaposed. This is the opposite of the effect on complementary colours when juxtaposed, each is enhanced. Neutrals enhance colours on the outside of the colour wheel - saturated colours.
Most colours (apart from yell and orange) look quite strong before dry and acrylics dry a shade darker. The yellow/green is a very bright but need a second coat to bring this out, as the yellow portion doesn't cover as well as a colour containing the addition of white, because it is opaque.
The muted orange and orange squares, being harmonious still subdue one another and the complements of the same saturated orange with blue still enhance one another.
Below these the pale violet and green hues makes the blue appear darker. The blue is enhanced by the surrounding black, but I'm not so sure if the same is true when blue is on the outside bordered by white.
Successive contrast
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