  There is a highly special point configuration in $\mathbb{P}^2$ of 31 points,
naturally arising from the geometry of the icosahedron. The 15 planes of
symmetry of the icosahedron projectivize to 15 lines in $\mathbb{P}^2$, whose
points of intersections yield the 31 points. Each point corresponds to an
opposite pair of vertices, faces or edges of the icosahedron. The symmetry
group of the icosahedron is $G=A_5\times \mathbb{Z}_2$, one of finitely many
exceptional complex reflection groups. The action of $G$ on the icosahedron
descends onto an action on the line configuration. We blow up $\mathbb{P}^2$ at
the 31 points to study the line configuration. The Waldschmidt constant is a
measure of how special a collection of points in $\mathbb{P}^2$. In this paper,
we study negative $G$-invariant curves on this blow-up in order to compute the
Waldschmidt constant of the ideal of the $31$ singularities.
