The yellow and black diagonal stripes remind me of caution tape, though maybe bumblebee stripes would be more accurate. This pair of socks was inspired by these socks here, though I didn’t follow that pattern and instead made up a pattern based on the pictures.
To get the bottom of the sock to be all black, I had to keep the yellow at the top. Since mosaic knitting always uses two rows of each color, that allowed me to knit across the top of the sock, and then purl back across of the top with the yellow each time it was used. I then had to do some extra rows with black on the bottom of the sock, so half of the time I knit across the top with the yellow, purled across the bottom with the black, twisted the yarns together, then knit back across the bottom with the black and purled back across the top with the yellow. For the other half of the yellow rows I did short rows with a wrap and turn at the left hand side of the pattern. I’m really happy with how small the gaps are, though I find the whole process remarkably tedious. It was worth it in this case though, because the yellow yarn is a 100% superwash merino that doesn’t feel very sturdy (I picked it for its color, for the rainbow shawl - the dyer was Copper Corgi), so by keeping the yellow on top and the sturdy black Opal sock yarn on bottom, I think the socks will wear much better.