Like many geometric figures, a heart can be captured in all its curvaceous glory by a single algebraic equation. The equation for a sphere looks simple enough: x²+y²+z²=1. A heart is something more complex: (x²+((1+b)y)²+z²-1)³-x²z³-ay²z³=0 Süss — German for “sweet” — is an interactive widget that allows you to tweak the algebra and customise the heart to your souls’