Background and Release
The EP was released on August 26, 2015, through Def Jam. With all songs containing writing by Cara, the preview of her debut studio album Know-It-All also included major songwriting and production contributions from the duo Pop & Oak.
- Here was released as the lead single from the EP on April 1, 2015.
Reviews of Four Pink Walls were positive. On the review aggregate website Metacritic, Four Pink Walls scored a 74 out of 100, based on 4 critics. Exclaim critic Michael J. Warren called the EP good enough to have expectations for Cara's upcoming debut studio album, writing that she was best at, especially in her songwriting, her "anti-pop star polish and self-determined presentation". 
The EP peaked at #11, #21 and #31 on the Canadian Albums Chart, the New Zealand Albums Chart and the US Billboard 200.
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