Mackinlay, Card Framework Data Types nominal, ordered, quantitative Marks point, line, area, surface, volume geometric primitives Retinal Properties / Perceptual Dimensions size, brightness, color, texture, orientation, shape,... parameters that control the appearance of geometric primitives separable channels of information flowing from retina to brain Data Variables 1D, 2D, 3D, 4D, 5D, etc Bertin; Wilkinson; Stolte et al closest thing to central dogma we've got 30