After doing color studies to make one color look like two based on value, then on hue, then saturation, and finally all three, I came to the final exercise in this section of David Hornung's book, “Color: A Workshop for Artists and Designers” (see previous posts). In this exercise, he asks you to make two colors look like one. Above is my version of the example he gives in the book. Yes, believe it or not the two small squares are two different colors. Here's the proof:
Trust me, the square on the left is the same as the small square above on the left and the right square is the same as the right one above. I wouldn't have believed it if I hadn't done it myself!