Draw a long, looping, self-intersecting line that meets back with itself at the start. Avoid having any 3 lines cross at the same intersection (although after a bit it may be fun to play with this). Then, select a color, and start coloring in the spaces created by your line’s intersections.

Can you color it such that you end with every section alternating colors?

Depending on how you use this activity, you may engage with different standards. Here are a few suggestions for how you might integrate the 8 mathematical practices. Feel free to add your own suggestions in the comments!

1.) Make sense of problems and persevere in solving them. Why can any graph be 2 colored?As you add intersections, how many new spaces are created? Can you create a function to describe the relationship between the number of intersections and the number of enclosed spaces? 2.) Reason abstractly and quantitatively. How many new spaces does each crossing create? 6.) Attend to precision. Ensuring that a 2-coloring is correct by methodically working through your design.