Stripes! I have made many knit sweaters with horizontal stripes, but not many (any?) with vertical stripes. Realizing something like this is sort of like a challenge to me – haven’t done a thing yet? Time to figure out how to do it! It was not difficult and I actually liked working with two yarns alternating closely like this. For me, it’s easier to do this kind of close color switching than it is to do it over larger spans of stitches – I don’t tend to work too tightly, which I sometimes can with other stranded knitting.