Designers at Huawei studied eye-tracking. They found that squircle icons force your eye to scan the perimeter (the rounded square) before reading the middle (the logo). The Harmony OS fluid icons guide your eye directly to the function.
The design philosophy behind an exclusive HarmonyOS pack centers on Fluidity and Connectivity harmony os icon pack exclusive
Huawei has created a strict for developers who want their app icons to be part of the "Exclusive" club. Designers at Huawei studied eye-tracking