"The Writing's on the Wall" is a song by American rock band OK Go. It was released on June 17, 2014, as part of the band's EP Upside Out, and is also the first single from the band's fourth studio album Hungry Ghosts. On the same day, the band released a music video in which the members use props to create optical illusions, reflecting the song's description of a relationship that fails because the couple has different points of view. Like previous OK Go videos, it is structured as a one-shot music video. The many YouTube views of the video caused the song to debut in the top ten of the US Billboard Hot Rock Songs chart, as well as number one on the Bubbling Under Hot 100 Singles chart.

"The Writing's on the Wall" is an alternative rock and pop rock song. OK Go frontman Damian Kulash said "The Writing's on the Wall" was written around "that moment in a relationship when you realize it’s coming to an end and that it’s inevitable", where there is the "feeling of having something coalesce and fall apart, like chaos and order". He said the song is written to be "melancholic and jubilant at the same time". The song lasts three minutes and thirty-five seconds. The arrangement of the mix consists of two heavily distorted bass guitars and drums, which Fridmann described as "very standard". The band spent a lot of time working on the bass parts sounding distorted, which were re-tracked with a Music Man StingRay. Friedman said "it was fun to track a live band because it was highly unusual for that session. We just knew that on this song, having them play together was the best way to tell whether our ideas were working."

The four-minute video is shot in a single take using a hand-held Panasonic Lumix DMC-GH4 camera mounted in a stabilizing Fig Rig frame, moved about by members of OK Go and assistants through a warehouse with about 28 stations consisting of everyday objects mounted on supports, clothing worn by the band, and painted walls and floors of the warehouse in specific arrangements. Each station plays on the use of optical illusions once the camera is set in position, such as those by Felice Varini that play on the illusion working from one specific point, or illusions like the Necker cube that are based on a lack of depth perception. All the illusions were created by the camera shots, without the use of any post-processing special effects.

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