Spend a fair amount of time setting up a nice build for this one only to find out I wasn't making the proper shape because the blue square was on top of a point that is mostly obscured by the blue square. While not a huge deal, I felt it was worth pointing out that this caused a lot of frustration.
I know I could have clicked the icon to see a detailed view, but I didn't feel I had to as at first glance it is a single layer shape. I also understand that the progression of the shape objectives tend to be additive, so that could be seen as another hint. However, I returned to this one after doing many other things.
My suggestion would be that mousing over these side icons could trigger the icon to expand like the shapes do in that one detailed view where their layer spread out.