[Gravityloss]

I saw a few of these black Anish Kapoor sculptures. The experience was worth the cost. The brain has a hard time processing it.

[kazinator]

Well, you've not actually seen the sculptures per se, only a missing area of the visual background, shaped like outline of the sculptures.

[Gravityloss]

True! One can walk around and then observe some of the shape. They were behind glass. So no touching, which means there was some unresolved ambiguity.