In the course of my teaching and tutoring experience, I’ve come across the fact that Americans often fall short of others in geometry1,2. Besides the fact of test scores, I see that in how difficult it is for bright high school students I tutor to grasp certain spatial concepts. In fact, I was recently tutoring one incoming tenth grader, and she was unable to visualize how many cubes were in a stack. Recently, I found these foam blocks in packs of 50 for $1.00 at Dollar Tree. I bought a bunch, and they have been so useful for my teaching…