The Non Slip Loop Knot. Superb. The strongest loop knot you can tie. Used by big game anglers worldwide. Easy to tie, far stronger and more reliable than the old fashioned strangulating figure eight knot that can substantially weaken line. Ultimate Knots
Paradox is an official Zentangle by Rick Thomas, Zentangle Founder. Illustrated by Margaret Bremmer CZT with an EXCELLENT Paradox tutorial and then some that shows how far you can push the paradox with variations!
Judy's Zentangle Creations: Zentangle Patterns
Zentangle - #Zentangle - hand drawn art - zentangle patterns - Enthusiastic Artist: Search results for paradox pattern - another great tutorial
Judy's Zentangle Creations: Paradox Triangles. Much easier than the way I've been doing it