Rays from all round converge to any point:
Study the point then ere you track the rays!
The size o' the circle 's nothing; subdivide
Earth, and earth's smallest grain of mustard-seed,
You count as many parts, small matching large
If you can use the mind's eye: otherwise,
Material optics, being gross at best,
Prefer the large and leave our mind the small—
And pray how many folk have minds can see?
Certainly you—and somebody in Thrace