Technically, he is correct. Those are circles, carefully made to LOOK like spheres. Unless your monitor is WAAAAY more advanced than mine, and those circles are sticking out both the front and back of it, with the glass bisecting the exact middle, they ARE only circles. 2D representations of a 3D object, yes, but still only a circle, due to them being, well, 2D. I can say definitively, however, that we’re all putting way too much energy into discussing circles vs. spheres. Myself included.