I live accross the road from a giant mattress.
No, seriously. The Wickwire field is made out of gravel, covered by a fake, spongy surface of recycled tires. It’s quite interesting to walk accross.
And every year they have to rip up all the tires, smooth out the gravel, and replace the field. This was what it looked like a few weeks ago.

The turf was ripped up and left in giant mounts on the field. Here’s a closer view: