Biochemists use computer to model the structure of molecules in three dimensions. Architects use computer-animated graphics to give clients visual walk-throughs of proposed buildings, to show possible exteriors, and to subject buildings to hypothetical earthquakes. Business executives mark bar graphs and pie charts out of tedious figures and use color to convey information. Finally, a new kind of artist uses computers to create cartoon animation, landscapes, television logo, action sketches, and print commercials.