In the example, the folder is recognizable as such from just its shape. The color merely makes it more recognizable (because folders are yellow on Windows — it

In the example, the folder is recognizable as such from just its shape. The color merely makes it more recognizable (because folders are yellow on Windows — it reinforces that the icon depicts a file folder). For accessibility reasons, you shouldn’t rely on only the color, but that doesn’t mean that color isn’t a very useful property to apply.