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Work with this topic is most productive when the theme can be given some time.
Because it is not traditional school mathematics it offers a good opportunity for students to explore something new and experience the emergence of structure for themselves.
Allow plenty of time for discussion :
How do we begin to talk about something which for most of us is just a tangle of string or a tied knot we do so automatically, like a shoe lace or a reef knot, that we hardly think about it ?
A knot collection might make a stimulating talking point for students in a classroom.
Some puzzles requiring no knowledge of knot theory, just a careful inspection of the patterns. A glimpse of the classification of knots, prime knots, crossing numbers and knot arithmetic.
Investigate how networks can be used to solve a problem for the 18th Century inhabitants of Konigsberg.
Read about the problem that tickled Euler's curiosity and led to a new branch of mathematics!