Magic tree

A sign next to a tree at the Killing Fields of Choeung Ek reads "magic tree: the tree was used as a tool to hang a microphone which make sound louder to avoid the moan of victims while they were being executed" (I think the tree was used to amplify music somehow)

4:39pm, Phnom Penh, Cambodia
Canon Digital Rebel XTi, F5.6, 1/125