A black rectangular graphic featuring a diagonal rainbow spectrum of parallel stripes and the word 'illuminarium' below.

This graphic design features a series of parallel, diagonal stripes set against a solid black background. The stripes span from the upper left to the lower right of the composition, creating a sense of dynamic motion and rhythm. The design is clean, minimalist, and relies heavily on high-contrast geometry.

The colour scheme follows a progressive rainbow spectrum. The stripes begin at the top left with warm hues of orange and yellow, transitioning through lime green and turquoise in the middle, and shifting to vibrant shades of magenta, purple, and blue toward the lower right. Each stripe is of consistent width, maintaining a structured, orderly appearance across the black field.

At the base of the design, the word "illuminarium" is printed in a bold, sans-serif, lowercase typeface. The text matches the bright blue colour of the final diagonal stripe, providing a sense of visual continuity. The overall aesthetic is reminiscent of mid-century modern design or retro-futuristic graphic art, focusing on pure colour, simplified form, and symmetry.