Working with primary colours and a selection of different yarns and threads on a black background:
This sample was interesting to see how the density and placing of the colours causes one colour to "pop" while another recedes. The turquoise is clearly the strongest contrast against the black background and lifts each section. In the top right section the use of small turquoise stitches at the edges makes the black and blue more dominant. The red is most visible where there is no turquoise.
Here the dense areas of blue lift the red highlights. The spaced lines of red and blue with black in between brings out the black as a strong contrast
Playing with sizing, spacing and colour...
Using dense stitches woven into a lattice to create a solid mesh of colour...
...and using the same technique to replicate warp and weft in a weave. The similar depth of shade of the two colours means that neither is dominant and they blend together.
Here I've used tiny stitches and combined three primary colours in different combinations. I wanted to see how the colours affected each other where the key variable was just the two colours. Working numerous permutations together allowed this to be seen more easily. The yellow largely predominates over both red and blue and is also a strong contrast against the black background. The pale blue and yellow are the exception, I assume due to the similarity of depth of shade. The red is striking viewed from a distance and is stronger against the pale blue. The deeper blue is dominant against the red.
This was just a bit of fun!