Tom Stoppard's observation offers a deceptively simple yet profound commentary on the nature of modern art and the way we define it. By stripping the art world’s complexities down to spatial relationships—paintings hang on walls, sculptures occupy physical space—the quote challenges the often intimidating, esoteric aura surrounding modern art, making it more accessible.

This statement demystifies modern art by framing it in terms of straightforward physical interaction; if you can see it on a wall, it’s a painting, if it surrounds you and invites physical navigation, it is a sculpture. In doing so, Stoppard attempts to bring modern art to a level that can be understood by everyone, even those unfamiliar with contemporary artistic theories and jargon. This simplification is a relief in a world where art is sometimes seen as an elitist domain, understood only by specialists.

Yet, this easy classification simultaneously spurs further reflection on how we assign meaning and value to art. While the quote is humorous and succinct, it gestures towards the idea that art's true significance and complexity lie beyond mere form and location—beyond whether it hangs on a wall or not. There's an implicit question raised: Should we allow such a basic approach to define artistic worth, or is there something deeper that we risk overlooking?

Ultimately, Stoppard’s quote invites us to appreciate modern art without feeling overwhelmed, promoting a more inclusive and straightforward way to engage. It encourages a balance between embracing both simplicity and complexity, suggesting that understanding art doesn't have to be difficult to be meaningful.