When the enigmatic street artist Banksy spray-painted a heart-shaped balloon covered with a Band-Aid on the wall of a Brooklyn warehouse, the nondescript brick building was instantly transformed ...

In 2018, a canvas that was part of Banksy's “Girl With Balloon” series sold in London for 1.04 million pounds ($1.4 million), only to famously self-destruct in front of a stunned auction crowd.

In 2018, a canvas that was part of Banksy's “Girl With Balloon” series sold in London for 1.04 million pounds ($1.4 million), only to famously self-destruct in front of a stunned auction crowd.

In 2018, a canvas that was part of Banksy's "Girl With Balloon" series sold in London for 1.04 million pounds ($1.4 million), only to famously self-destruct in front of a stunned auction crowd.

A slab of Brooklyn wall that the artist Banksy emblazoned with a bandaged, heart-shaped balloon is emerging after more than a decade in storage. It is set to be auctioned off May 21.