Colors and greyscales and music?

[eandersonase]

Why would one need something like this?

http://theghostlystore.com/products/designer-tool-kit

Developed by Walking-Chair Design Studio, Vienna, the Designer Tool Kit comes with studio essentials for referencing on the fly. Included in the kit are two folding color bars to help navigate the CMYK world at a glance: the first features the 4 primary values and 79 popular variants while the second shows 81 “achromatic” colors. The reverse of each bar is printed in Pantone Black 3U and shows the greyscale from 95 to 5. Also included in the kit is a folding ruler that allows you to measure line widths, scales, and the most common CMYK variants. All three items are printed on postcard stock.