Minecraft wiki entry for Creating_shapes, associated text: Circles are rather difficult to make in Minecraft, partially because of the fact that unlike triangles, there is not one way to make any size of circle; each size uses a completely different arrangement of blocks. As you look at the different sizes of circles, you will see that not all of them have the same shape, and none of them are a perfect circle. This is because different sizes of circles must have different arrangements of blocks, so that they can look as close to a circle as possible.