Why is it vanishing instead of vanished?

The Vanishing Glass

. . . . . .

Dudley came waddling toward them as fast as he could. “Out of the way,
you,” he said, punching Harry in the ribs. Caught by surprise, Harry
fell hard on the concrete floor. What came next happened so fast no
one saw how it happened — one second, Piers and Dudley were leaning
right up close to the glass, the next, they had leapt back with howls
of horror. Harry sat up and gasped; the glass front of the boa
constrictor’s tank had vanished. The great snake was uncoiling
itself rapidly, slithering out onto the floor. People throughout the
reptile house screamed and started running for the exits. As the snake
slid swiftly past him, Harry could have sworn a low, hissing voice
said, “Brazil, here I come… Thanksss, amigo.” (Harry Potter and the
Sorcerer’s Stone)

From the following content, it seems like The Vanished Glass is more suitable than the title. What does the title mean?


This passage is about a surprising event: one moment the glass is present, the next moment the glass is absent. This sudden event is the glass vanishing. Thus the important feature of the glass is that it is a vanishing glass: it is a glass that vanishes.

A vanished glass would be a glass that was present in the past, and is no longer there now. This description applies to a vanishing glass, but it is less precise, and a vanished glass is not in itself a surprising fact, unlike a vanishing glass. A vanished glass could have been taken away by someone while nobody was looking. A vanishing glass, on the other hand, is a decidedly supernatural event.

Source : Link , Question Author : Listenever , Answer Author : Gilles ‘SO- stop being evil’

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