only horizontal, vertical and 45-degree diagonal lines
each icon should be no larger than 20px wide or tall
no two lines can be less than 2px apart
The idea behind these rules is to create a consistent harmony between each icon. And I liked the challenge of having these constraints.
I started making these icons as part of a live project but wanted to put together a complete set. I've attached the vector file in case you want to take them for a spin in your own designs.
