New York City has seen more than its share of crazy street art through the decades. This new series of computer error message-themed street art from prolific and mysterious artist Jilly Ballistic has a decidedly modern aesthetic.

Found mostly added to advertisements around NYC, the computer dialog boxes warn passers-by about low batteries or the impending deletion of certain images, or ask for acknowledgement of some other action.

Blending the familiar geeky aesthetic of computer error codes with the sleek and polished models on the outdoor advertisements makes for an arresting series of images.

Familiar as we are with both outdoor advertising and computer dialog boxes, it might be easy to walk past one of these advertisements without realizing that something is not quite right. But for those who take the time to stop and look, Jilly Ballistic always has something to say.