This technique creates intangible copies of the user. The clones are simply illusions and will dissipate when they come into contact with something. The illusions can be seen through by the Byakugan and the Sharingan. A person with normal eyes can also distinguish the clones from the original, since the clones will not disrupt the area around themselves with their movement (won't kick up dust, crush grass, etc.). Naruto Uzumaki and Rock Lee are the only two ninja known to pass at the Academy without mastering this jutsu.