The sphere displays different images but the blinking eye is startling some people. The BBC asked people in Washington DC if they follow Canadian politics and about the future of US-Canada relations.

One day, a sphere appears before the square ... From this new perspective, the square has a bird's-eye view of Flatland and is able to see the shapes of his fellow inhabitants (including, for ...

Astigmatism occurs when the eye is shaped more like an oval than a sphere, causing blurry vision. Astigmatism affects about one in three Americans and it occurs more frequently as you age.