A room full of goldfish

Out of the gloom it suddenly appears. Pale, pulsating and otherworldly it floats upside-down through the shadows, it flirts with the idea of becoming visceral.

But it does not, and instead shimmers and teases in a sort of grotesque fascinating burlesque, a vague ethereal organ. 

Like a deep-sea creature it half shimmies, half propels itself through the darkness away from prying eyes.