You should read thisJanuary 15, 2014
Cubes are just that in appearance, six inches across, like ancient bronze, and glow green and blue when active. Cubes store approximately 10 years of constant sound, and when first activated by dwarfs are filled with natural sounds (such as running water and birdsong).
Cubes are activated and deactivated by set sensual stimuli, which is most commonly a spoken word, but can be "a breath, a sound, a temperature, a point in the world, the smell of rain." Many cubes have never been prompted to work.
It was a Cube, perpetually replaying sounds from the Battle of Koom Valley, that drove the painter Methodia Rascal insane during the painting of his life's work: The Battle of Koom Valley.
The Cubes mentioned thus far bear a striking resemblance to the Thing in The Bromeliad Trilogy, although the Thing possessed its own intelligence rather than being a recording device.