Why did Alexander Calder use primary colors?

Alexander Calder utilized primary colors—red, blue, and yellow—because they convey a sense of simplicity and vibrancy that aligns with his focus on form and movement in his sculptures and mobiles. These colors are visually striking and create strong contrasts, enhancing the dynamic quality of his work. By using primary colors, Calder also embraced a minimalist aesthetic, allowing the shapes and movements of his art to take center stage without distraction.