Celtic key (or maze) patterns figure prominently in a few past and a bunch of upcoming projects. So, I made a quick video with some basics on how I assemble those as vector art images. I used Inkscape for these but, the principles are the same for any vector art program.
Celtic Art: The Methods of Construction by George Bain
Celtic Key Patterns by Ian Bain
Celtic Pattern: Visual Rhythms of the Ancient Mind by Adam Tetlow
(Proceeds from associate links defray hosting costs for a local arts organization, Arizona Aikido.)