more of an accent than a language), Norse with "Nørdic åccents", Egyptians in faux hieroglyphs (depictive illustrations and rebuses), etc. Another experiment with speech bubbles was exclusive to one book, Asterix and the Roman Agent. The agent in question is a vile manipulator who creates discord in a group of people with a single innocent-sounding comment. His victims start quarreling and ultimately fighting each other while speaking in green-colored speech bubbles. Font variation is a common tactic in comics. The Sandman series, written by Neil Gaiman and lettered by Todd Klein, features many characters whose speech bubbles are written with a font that is exclusive to them. For examples, the main character, the gloomy Dream, speaks in wavy-edged bubbles, completely black, with similarly wavy white lettering. His sister, the scatterbrained and whimsical Delirium speaks in bubbles in a many-colored explosive background with uneven lettering, and the irreverent raven Matthew speaks in a shaky angular kind of bubble with scratchy lettering. Other characters, such as John Dee, have special shapes of bubbles for their own. For Mad magazine's recurring comic strip Monroe, certain words are written larger or in unusual fonts for emphasis. In manga, there is a tendency to include the speech necessary for the storyline in balloons, while small scribbles outside the balloons add side comments, often used for irony or to show that they're said in a much smaller voice. Satsuki Yotsuba in the manga series Negima is notable because she speaks almost entirely in side scribble. Graphic symbols Speech bubbles are used not only to include a character's words, but also emotions, voice inflections and unspecified language. Punctuation marks One of the universal emblems of the art of comics is the use of a single punctuation mark to depict a character's emotions, much more efficiently than any possible sentence. A speech bubble with a single big question mark (?) (often drawn by hand, not counted as part of the lettering) denotes confusion or ignorance. An exclamation mark (!) indicates surprise or terror. This device is used much in the European comic tradition, the Belgian artist Hergé's The Adventures of Tintin series being a good example. Sometimes, the punctuation marks stand alone above the character's head, with no bubble needed. In manga, the ellipsis (i.e. three dots) is also used to express silence in a much more significant way than the mere absence of bubbles. This is specially