Soul Music - Wall

Something golden-brown and viscous was oozing out on to the street from what was just possibly, behind the mounds of the stuff, a shop. As the two wizards watched there was a tinkle of glass and the brown substance began to emerge from the second floor. Ridcully stamped forward and scooped up a handful, leaping back before the wall could reach him. He sniffed at it.

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Soul Music - p152