I was inspired by “Twill Illusions with Two and Four Blocks” by Freya van Holst Pellekaan, p. 96 in Best of Weaver’s: Twill Thrills (2004). Basic threading, tie-up, and treadling for 5-end satin blocks is in Handweaving.net #74464. Warp color progression, right-to-left: 514 ends plus...