The video is rather lengthy, so here's a boiled down version of it - generally, the further you are from your original colour on the colour wheel, the lower the saturation you should choose, if you're going for a more harmonious selection of colours. As we've seen, the perception of colours change depending on its surroundings. Therefore even the humble grey block may appear to take on green hues when surrounded by a vibrant shade of red, and one should account for this illusory effect when applying colours from opposite ends of the color wheel in the same painting.