Corrected entry: After Hagrid did the combination on the brick wall, you can see, as the are entering Diagon Alley, that the bricks are with cement despite being spinning and moving a few seconds earlier.
Malaver
21st Jun 2004
Harry Potter and the Philosopher's Stone (2001)
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Correction: It's probably some kind of magic cement which allows the bricks to do their trick and then become solid again.
Sereenie