Art darling Isabelle Bscher is bringing Andy Warhol’s famous Polaroid pictures to New York City, along with paintings by Ronnie Cutrone, who worked with Warhol for a decade.

Today, we bring you another focus challenge, in which we invite you to spend uninterrupted time looking at a piece of art.

An ancient granite pebble included indentations resembling a face, its nose a red dot. A study says it may have had symbolic significance.