How do you create Transparency?

At another great Lorraine Torrence class, we learn about creating depth in a 2-Dimensional work. Many of these techniques you are familiar with, such as overlapping a leaf over a stem...

or depicting the moon as a small circle in the sky.

To create transparency, a change in value is required. What if you overlapped two leaves?

Have these leaves changed color? No, but their overlapping position changes the values in those areas. A sense of depth by the nature of the placement of color. Here is my attempt at transparency with fabric:

This isn't the best picture, but you can see the changes in color when the circles overlap. I simply cut out a shape of another color to create the illusion of depth. I knew yellow and blue made green, so I inserted an arc of green fabric in the overlapping area. Here it is quilted:

Are they parasols? Flowers drifting along a river? Or Japanese lanterns? Intead of landing flat on the black background, they are flimsy and see-through. That's transparency. Fun, right?