Genjutsu(Illusionary Techniques) are techniques that are employed in the same fashion as ninjutsu, requiring chakra and hand seals. However, the primary difference between the two is that the effects of genjutsu are illusory; instead of attacking the victim's body, like taijutsu or ninjutsu, genjutsu techniques manipulate the flow of chakra in the victim's brain, thus causing a disruption in their senses. This is frequently used to create false images or to cause pain from trauma (because the body is led to believe it is in pain); however, there are plenty of other uses depending on the situation. They are not used as often as ninjutsu because they don't physically harm the opponent, but several characters have made themselves well known for their great prowess with genjutsu like Itachi Uchiha,Kurenai Yuhi, the Second Mizukage, and Tayuya. Genjutsu can also be used to manipulate others, similar to brainwashing by feeding the victim illusive suggestions, the primary example being Tobi controlling Yagura. However, there exists at least one genjutsu,Izanagi, that has the opposite effects to normal genjutsu, by changing reality to illusion and vice versa. Genjutsu can also be used for other supplementary purposes such as interrogating an individual by breaking their will.Genjutsu is created when a ninja controls the chakra flow of the opponent's cerebral nervous system, thereby affecting their five senses. Those with special abilities like the Uchiha clan's Sh aringan— which can cast generic genjutsu— or with high intelligence have an easier time executing and countering genjutsu. Those under the influence of genjutsu will either appear to be unconscious or continue to move around under the pretence of the genjutsu. The latter is very effective in battle as a genjutsu user can make themselves appear to be somewhere else and attack the victim from behind or change the environment to make the victim see a flat plain where there is a steep cliff.Genjutsu attacks usually require a lot of skill, and, if performed incorrectly, will not work. Genjutsu is most often used by ninja with very precise chakra control and very high intelligence. It is explained in the anime that because genjutsu affects activity throughout the prosencephalon structure of the brain, humans, dogs and other species of mammal are therefore all affected by genjutsu; however, the kikaichu, like all insects, lack such a structure to their brains, and so do not even notice it: as Shino Aburameput it, insects are ruled almost solely by their senses alone, which makes them immune to genjutsu and gives the Aburame clan an ability to detect it, even when heightened senses become succeptible.Shikamaru Nara states that among genjutsu the most dangerous are those that affect the opponent with sound allowing the user to stay out of sight. Tayuya is a great example of this sound-based, long-range type of combat.It is shown that genjustu can be "stored" inside of special pills that produce the genjutsu once the target ate a pill and went to sleep.The sometimes more complex genjutsu, although still employing illusions, have elemental chakra natures associated with them. Techniques such as these are less common, however. Such examples are Water Release Genjutsu: Demonic Phantom Fog Prison and Lightning Illusion Flash of Lightning Pillar.