Putting all the primary colors in a design is pretty easy. I've done it many a time. However, I've always admired those artists who manage to put all the secondary colors in a piece, which is a much harder task. This is my attempt to do so, and I think it worked out. In hindsight, I wish I had eliminated either one of the orange tones or one of the grean tones--it's a bit busy for a mosaic of this scale.