Roundness is one of the most fundamental and universal shapes in nature and engineering. From the orbits of planets to the ...

and then shapes appear above it as the narrator mentions them. NARRATOR: If you look carefully you can see them all around you – squares, rectangles, circles and triangles! Inside a barn ...

There's dozens of different crop circle formations including crescents, rings, arcs, diamond shapes, spirals, knots and concentric circles. Show me a sign! The Circlemakers see crop circle ...

These naturally occurring shapes last for decades ... from the University of Hamburg in Germany to dig trenches inside the circles. Juergens found that within every circle, the sandy earth ...

My favorite shape is the loop, a circle with all geometric information ... an algebraic object that counts how many ways a loop can be squeezed inside a space. And knot theory is an entire field ...