Thank you for downloading from the BBC.

The details of our complete range of podcasts and our terms of use

go to BBCWorldService.com slash podcasts.

Now for the final programme of the series, we travel to Egypt

with the designer and structural engineer Cecil Balmond

as he explores the iconic geometry of the great Pyramid.

Driving through Giza here, what makes the Pyramid standout

is the simplicity of the form and trying to get a sighted object

and the stones just piling up right to the top.

Now I'm looking at the Pyramid above the TV areas on top of the buildings here,

quite in Congress, and that purity of form still makes its standout

and it's unambiguous.

I have been on a journey through shape and structure,

with three fundamental forms as my guide.

On Earth we can draw circles and we can create symmetry,

but in the universe there's already a lot of symmetry.

The power of the world always works in circles.

As soon as you want to portray something in space,

the square is incredibly helpful.

They begin to see the whole country as a magic square.

Now my journey is reaching its final destination,

with perhaps the world's greatest superstructure,

...