The shoes are structured with carbon-fiber and covered in fine leather. I was surprised to learn that the styling isn't just for looks, but might actually work:

One late summer night in the studio I was thinking about the design of shoes in general. I wondered why there was the need for a foot plate in shoes such as high heels When I look at a foot print on sand it is very clear to see that the main force goes to the heel and ball. With a high heel providing the heel is supported, even by standing on a wooden block the foot naturally ’spans’ the gap naturally, with bones and tendons. The foot has its own inbuilt strength and support so why duplicate this. You would not have a jumper with rigid arms between elbow and wrist.

The retrospective includes 105 career-spanning pieces, many of which are available to view on the website.

Sol leWitt, Wall Drawing 1042. Still image from timelapse.

Several drawings feature timelapse clips revealing their construction process. (Those should be your first stop!)