Based on a 2-out-of-5 Dekany scale designed by Erv Wilson. The scale is part of family of scales called Combination Product Sets. More information can be found here: http://www.anaphoria.com/hexany.pdf
The scale has the following ratios:
65/64, 35/32, 299/256, 5/4, 161/128, 91/64, 23/16, 13/8, 7/4, 115/64
The cover image was made with the Wilsonic iOS app.