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From the article on Ramanujan's math structures, here are the 3 starter graphs we're creating using javascript:
"Algebraic varieties, or shapes cut out by polynomial equations that can be written as sums of variables raised to whole-number powers.
1. A line, for instance, is cut out by the equation: x + y = 0,
2. A circle by: x2 + y2 = 1,
3. A figure eight by: x4 = x2 − y2.
While the line and circle are completely smooth, the figure eight has a point where it intersects itself — a singularity."
Our figure eight CoLab rendering a figure eight.