Although I'm not the happiest with how these lines turned out, I do really enjoy this Celtic knot design. It is very similar to the basic 4x4 windmill knot, but the break lines are extended by one unit.

Which orientation do you like better? Square or diamond?

Products in this video:

Graph paper notebook: https://amzn.to/3tk8YcW
Pencil for drawing grid: https://amzn.to/33fFuT2
Lead sharpener: https://amzn.to/3nLlPE1
Green pencil: https://amzn.to/3xO0DC3
Black outline pen: https://amzn.to/2RrufEh
Very fine pen: https://amzn.to/3nNTJrN