A single concave circle symmetrically nestles in a square with flat front and sides. The deepest point of the concave circle is nearly 3 inches deep and curves up towards...
A single concave circle symmetrically nestles in a square with flat front and sides. The deepest point of the concave circle is nearly 3 inches deep and curves up towards its outer edge where it meets the square. The whole form is halved by an opaque orange painted triangle.