Oxelot and  J.Carignan gave my work new inspirations as you can read in the comments. Thats why I reworked the design - hope you like it.

As you can see the new approach works with translucent material. The trick is that the front print (chart 1) plus the back print(chart 2)  show in combination the whole visual: The vapur drop (chart 3). Thats why I called the design: ADDITION.

Thxz for those very inspirational advices!