  Krasnosselsky's art gallery theorem gives a combinatorial characterization of
star-shaped sets in Euclidean spaces, similar to Helly's characterization of
finite families of convex sets with non-empty intersection. We study colorful
and quantitative variations of Krasnosselsky's result. In particular, we are
interested in conditions on a set $K$ that guarantee there exists a measurably
large set $K'$ such that every point in $K'$ can see every point in $K$. We
prove results guaranteeing the existence of $K'$ with large volume or large
diameter.
