Joukowsky transformation of a circle centered at $\left(1,1\right)$ of radius $1$ is a curve resembling a heart.

To be specific, it is

$\left\{1+\mathrm i+\mathrm e^{\mathrm it}+ \frac1{1+\mathrm i+\mathrm e^{\mathrm it}} \,\middle|\,t\in\left[0,2\pi\right)\right\}$

on the complex plane.