#2088: Schwarzschild's Cat

XKCD comic, described below.
Transcript

[A graph is shown. The x-axis is labeled "Cat size" and the y-axis, "Cat cuteness". Parallel to and a short distance from the y axis is a dashed line the same length as the y-axis line, representing a vertical asymptote; the space between the y axis and the dashed line is labelled "Critical Limit". Graphed is a function coming down from infinity, starting close to the dashed line; it then levels off and does not reach zero on-screen. At the top end of the graph is the text "Schwarzschild's Cat" and an arrow pointing upwards outside of the graph.]


(Sourced from explainxkcd.com)

Cats can be smaller than the critical limit, but they're unobservable. If one shrinks enough that it crosses the limit, it just appears to get cuter and cuter as it slowly fades from view.

ExplainOriginal