These Unicode patterns by Yuan Chuan are extraordinarily clever. It's a
<css-doodle> custom web component that sets up a CSS grid and randomizes what character to drop into a cell and things, like color.
Color is pretty good for separating things. That's what your basic pie chart is, isn't it? You tell the slices apart by color. With enough color contrast, you might be OK, but you might be even better off (particularly where accessibility is concerned) using patterns, or a combination.… Read article