One way to draw a Celtic knot is to draw squares with diagonal lines intersecting each one, then draw arcs to create the curved parts of the knot. Make the curved and diagonal lines thicker, and erase the initial squares. You need graph paper, a pencil and an eraser.
- Draw the squares
On a piece of graph paper, make a large, wide rectangle. Divide the rectangle into four equal squares.
- Make the diagonal lines
Draw a diagonal line in the leftmost square going from the top-left corner to the bottom-right corner. Continue the line in the next square, going to the top-right corner. In the third box, draw the diagonal the same as the first box. The diagonal in the fourth box is like the one in the second box.
- Draw the arcs
Draw an arc going from the top-left corner of the first box to the top-left corner of the third box. Make an arc going from the top-left corner of the third box to the top-right corner of the fourth box. Draw another arc going from the bottom-left corner of the second box to the bottom-left corner of the fourth box.
- Make the lines thicker
Draw lines on either side of the curved and straight lines to make the lines thicker, making sure that the lines on either side are equally spaced from the central, initial line. Erase the central curved and straight lines and the squares. Continue the pattern to make a longer Celtic knot.