A string is an integral part of the Zentangle method.
As defined in "The Book of Zentangle",
String: A string is a line or lines that divide a marking surface into sections to be filled with tangles.A string is drawn with pencil.
This week my class was all about strings. We explored the way a string acts as a
skeleton, a structure, a foundation, or a root system for you to build you drawing from. Once we worked through how to put down a string we ever so naturally watched how our tangles attach and cover it like a skin over a skeleton, bricks over a structure, a house over a foundation, or a flower from a root.
The work that was created as we played with these thoughts was AMAZING.