Green Squares Surrounded by 6 Colours Within its Spectrum

Center colour seems to diminish the more alike it is to its surrounding colour.

Center colour appears more vibrant the greater the contrast is of its surrounding colour.

Two complementary colours mixed, this being the brightest of their scale:

And its complementary:

Exploring Contrasts of the complimentary colour pair and neutral colour:

Because the tonal values of the complementary colours are equal;  I did not see a great difference in contrast when placed near the neutral colour.  I did notice the neutral colour’s hue varies seeming warmer inside the square of reddish complimentary, and cooler inside the square of the greenish complimentary colour.