The Ultimate Art!! (究極の芸術!!, Kyūkyoku no Geijutsu!!) is chapter 277 of the Naruto manga.
Naruto and his shadow clones surround and pummel Deidara, only to discover that they are attacking a Clay Clone. Frustrated, Naruto begins to develop a chakra cloak, which Kakashi suppresses with a seal given to him by Jiraiya in case this happened. Chiyo and Sakura join up with them, revealing to Deidara that Sasori has been defeated. Upset, Deidara tries to sneak away but is stopped by Team Guy, they having finally defeated their exact counterparts. Cornered, Deidara consumes some clay and starts to blow up.