Happy Valentine!

We wish you all a happy Valentine's day with origami hearts and an equation.

Let's make a plot in polar coordinates, of $r = |\phi|^p$. The angle $\phi$ goes from $-\pi$ to $\pi$,  and $p \approx 1$. Here is the plot, in processing, with $\phi = 0$ pointing up. Move the mouse to change $p$!

Mathworld has more equations for hearts, but none of them is as simple as ours. As $p = 1$ gives a nice shape, $p$ can be left out for an even simpler equation.