Painting: Paint on Canvas.
This is beautifully balanced, particularly the placing of the central white 'sun'. The unnatural palette - particularly the green across the top and at the back - gives a sense of potential violence against the calm warm yellow. The swipe across the top makes it much more dynamic than it would have been. Red spot the is the "sign" or "eye" in the yellow flow.
Keywords: yellow, organic, Signum, expression, green, liquid, orange