Accessibility of directions depends on asymmetries of the body and asymmetries of the world (p 7). Along the [front/back] axis, front has a special status, as it is the direction of orientation, of perception, and of potential movement (p 7).
Learning to measure strike and dip of sedimentary strata or other planar surfaces is a well-known stumbling block for introductory geoscience students. . . . Strike is the compass azimuth of the line defining the intersection between the surface to be described and the horizontal plane. Dip is the angle between the horizontal plane and the surface to be described, measured within a vertical plane perpendicular to the strike line. Strike and dip measurements can be made in the field with a geologist's compass. These two measurements together un
