From Leger, Functions of Painting, "The Spectacle: Light, Color, Moving Image, Object-Spectacle" 1924:
"Everyone regretted the disappearance of the Great Wheel; it was a familiar silhouette. It was better than the Eiffel Tower because of its form. An entire object whose initial form is the circle is always much sought after for its value of attractiveness.
The wheel, lighted and colored, dominates the street carnivals.
The circle is satisfying to the human eye. It is a totality, a whole, there is no break in it.
The ball, the sphere, have enormous possibilities as plastic values.
Put a sphere or a ball--never mind what material it is made of--in your apartment. It is never unpleasant and always will fit in wherever it may be. It is the beautiful object with no other purpose than what it is.
We live surrounded by beautiful objects that are slowly being revealed and perceived by man; they are occupying an increasingly important place around us, in our interior and exterior life."
