For layering and separation I found this poster from the animated movie Missing Link (Laika Studios, 2019). From what I understand, this Tufte principle is about combining design elements, pushing parts into the background and bringing others to the front to give separation of information. This helps to separate the important information into a layer in the design of its own and allow it to be highlighted. I think this poster could also show comparison of small multiples because it has the characters centralised in one location so the viewer can compare and contrast their designs together along with the foreground elements in the water able to be compared together.
Below is the example I have chosen and a version of it which I drew on guidelines to highlight some of the more obvious layers in the poster that I can see. In this poster the title and actors names are in the foreground of the design and are meant to be a promenant part of the design. However as you can see in this poster the characters are also a focal part of the design, shown on separate layers of the poster. The largest character is the main character of the movie and the two smaller ones, on a similar layer within the design, are the secondary side characters within the film. I think this is a clear use of this tufte principle as it shows the important information well and allows the viewer to garner information about the characters from their prominence and separation in the poster. There is also a layering effect with the mist used in the poster to add the background, mid and foreground layers of scenery to the poster. These are separated by this clouding mist element in the design which I think works really well.
References:
[1] Butler, C., 2020. Missing Link (2019) – Movie Posters (1 Of 2). [online] Joblo.com. Available at: https://www.joblo.com/movie-posters/2019/missing-link/image-35192 [Accessed 26 October 2020].