Graphs are wonderful thing in the learning of maths.
Not only does it reflects visual symptom or trend in data collected, it displays, if allowed, beautiful images.
This is possible if you allow you maths juice to go free and create mathematical expressions to your fancy and view them on a graph.
Below I have created one. I visual it as water rippling through a surface (on the top view).
Hope you like this maths art of mine.
NOTE: It is created using trigonometry of circulatory expression.
Here I view a water droplet going down into the centre. It then produces ripples or waves spreading outwards in a circular manner.
Maths expressing ......