Pixel art. There’s a lot to know 🙇‍♂️ about lines—curves in general—in this art form, as it is a basic component of drawing and drafting, and the separation the human vision system perceives between differently colored blocks. Smoothing is done selectively with anti-aliasing.
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![pixel art lines drawn at angles](https://cdn.uploads.micro.blog/6439/2022/7b0c25959e.png)