Based on perfect circles and squares (e.g., Futura ). They feel architectural and clean.

Sans serif fonts—typefaces without the small decorative strokes (serifs) at the ends of character lines—represent the "less is more" philosophy of modern design. While serif fonts are rooted in the tradition of stone carving and the printing press, sans serifs are the children of the industrial revolution and the digital age. The Origins of "Gothic" Type

In short, sans serif fonts are more than just "fonts without feet." They are the visual language of the modern world—prioritizing clarity, efficiency, and a forward-thinking aesthetic.