Artists of many diverse types began using simple forms to their own ends.
In conceptual art the idea or concept is the most important aspect of the work
Your work isn't a high stakes, nail-biting professional challenge. It's a form of play. Lighten up and have fun with it.
The idea part is simple but the visual perception is complex.
Minimalism wasn't a real idea - it ended before it started.
Most ideas that are successful are ludicrously simple