What’s the skill of a Logo?

No-compromise positive/negative image inversion
Recognizable in seconds
High-contrast to subsurface
Ageless and classic; long-living
Authentic to the owner
Effective area ? used area
Variable and modularly useable
Portrayable from 5mm to 5m
Producible with all common techniques

Clear + Concise. Less is more. (Gottfried Keppler)