"4th Dimension" is a song by American hip hop duo Kids See Ghosts, composed of the rappers Kanye West and Kid Cudi, from their eponymous debut studio album (2018). The song features a guest appearance from Louis Prima, who was credited as a featured artist due to his work being sampled. It was produced by West, with additional production from Mike Dean and Noah Goldstein. The producers co-wrote the song with Kid Cudi and Prima, with the latter of the two receiving credit as a result of it sampling music by him. A hip hop song, it samples Prima's "What Will Santa Claus Say (When He Finds Everybody Swingin')" and Shirley Ann Lee's "Someday". Lyrically, the song features Kids See Ghosts presenting their thoughts to stop themselves from becoming worried.