The bowline knot is extremely useful in many craft projects. Using the image of a rabbit will help you and your kids (if you have any) to tie this knot. It is not too hard to master (an eight-year-old is tying the knot in the pictures above). The advantage of the bowline is that it forms a loop that will not pull out no matter how hard you pull. Another nice thing about this knot is that it is easy to undo.