The Vanishing Glass
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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?