He has a dark side

Prompt:  Create an image on a stark black background featuring a solid black equilateral triangle in the center, representing a gnome's hat. A gnome is wearing the hat, he is standing in a recording studio. The gnome has whimsical an quirky eyes. A single white beam of light enters the hat from the left side and exits as a spectrum of a rainbow, depicting a prism effect. The rainbow colors are arranged in the following order from top to bottom: red, orange, yellow, green, blue, indigo, and violet. This spectrum spreads out in a wide band, diverging as it moves to the right side of the image. The overall aesthetic is minimalist and iconic with precise geometric shapes.