“…Consistent with this idea, and as also apparent in Figure 1, the shape similarity of objects is more readily perceived when the views of objects are aligned by their major axis (Sekuler, 1996; Tarr, 2003; see also Dickison, Leonardis, Schiele & Tarr, 2009). Several recent proposals have further suggested that the major axis –and physical rotations and alignments with respect to that axis -- play a role in the developmental processes that build integrated 3-dimensional representations of object shape from 2-dimensional views (Smith, 2009; Graf, 2006; Farivar, 2009, Cutzu & Tarr, 2007; Pereira, James, Jones, & Smith, 2010; James, Swain, Jones & Smith, 2013). The idea is that by rotating the major axis (in all three planes) children self-generate the visual information that is the basis for building integrated views (see Graf, 2006; Farivar, 2009) and that by stacking and aligning objects, children extract the major axis as a frame of reference for comparing shapes (see Smith, 2009).…”