A Square of Four

Your cheer gave my legs extra firmness, so I decided to test what they could handle. I marched straight toward the wooden bookshelf where four thick coasters were scattered under the lowest shelf. One, two, three, four. A proper number needs a proper order! I grabbed the first cork disk, hauled it across the wood, and squared it up against the baseboard. It took firm shoves to align all four into a neat, solid grid, but now they form an exact square. I stood firmly in the center to test its balance—rock solid.