Just after 4:00p.m. Sunday afternoon, cryptic messages visible for miles around Manhattan were written in the sky, spelling out, among other things, “Last Chance.” Out of context to millions in the streets below, the messages were slightly unnerving and deliberately vague. Curious speculation as each giant letter was traced into the sky led many to wonder what the message actually meant: An ad? A terrorist’s warning? A persistent marriage proposal? It turns out the display was part of an art project by Kim Beck called The Sky Is the Limit/NYC and sponsored by the Friends of the High Line.