Everything had shattered. The fact that it was all still there — the walls and the chairs and the children’s pictures on the walls — meant nothing. Every atom of it had been blasted apart and reconstituted in an instant, and its appearance of permanence and solidity was laughable; it would dissolve at a touch, for everything was suddenly tissue-thin and friable.
Everything was curved to fit the walls: the stove, the sink and the cupboards, and all of it had been painted with flowers, insects and birds in bright primary colours.
You'd think I walk around with my eyes shut, banging off the walls.
He sounds exactly like Moody," said Harry quietly, tucking the letter away again inside his robes. "'Constant vigilance!' You'd think I walk around with my eyes shut, banging off the walls.
They don’t need walls and water to keep the prisoners in, not when they’re trapped inside their own heads, incapable of a single cheerful thought. Most go mad within weeks - Lupin
And Hermione was struggling to her feet in the wreckage, and three red-headed men were grouped on the ground where the wall had blasted apart. Harry grabbed Hermione's hand as they staggered and stumbled over stone and wood. 'No - no - no!' someone was shouting. 'No! Fred! No!' And Percy was shaking his brother, and Ron was kneeling beside them, and Fred's eyes stared without seeing, the ghost of his last laugh still etched upon his face.