It is distinguished from a normal Sharingan by its appearance, which changes the form of the tomoe seal. Unlike the Sharingan, the appearance of the Mangekyō Sharingan differs from user to user with all known wielders of the dōjutsu having eyes that resemble variations of pinwheels; one variation is known as the "Straight Tomoe" (直巴, Choku Tomoe), which seems to grant the user fluidity in their movements when fighting.[46] - Wiki