As a Lightroom educator, I find that new users are constantly confused by the relationship between the images in the filmstrip and the image in the center content area. In the filmstrip, Lightroom puts black and white diamonds over the two image while the center content area labels the same images the words "Select" and "Candidate". It's not intuitive to make the association that the Candidate is represented with a black diamond in the filmstrip and the Select is the image with the white diamond. Why, not be consistent and include the black and white diamonds in both locations? Or use an "S" and "C" in the filmstrip?