"Erasure was a very important part of late 20th Century Modernist thinking. It allowed for more freeways, more roads. It took whole sections of the city and turned them into what seemed more functional.
"What’s generating memory, it’s usually things that were erased, half finished, spaces that were contested. But if you come to it after it’s been destroyed, of course there are only the traces that are left on the streets. And if the traces have been leveled you have this peculiar relationship with it. You can’t even believe what’s happened.
"You see an illustration of a wall and, let’s say, the floor. And then for some reason the line where the wall and the floor meet has been so erased that you can’t take your eyes away from it. Because it’s the thing that’s missing. The absence makes a presence. And it speaks to you, tells you something about how the wall and the floor work together. So Bunker Hill is an absence that is a presence."