Tiling of the supragranular layers with multiple copies of the hemi-retinal image. Adjacent tilings of the local map are reflected about either a vertically or horizontally oriented axis. The upper part of the image shows tiling shows linear zones extending vertically, between columns of singularities. The lower part of the image shows saddle-points between singularties. The only difference between the two tiling patterns is that, in the upper portion of the image, every second row is translated in the horizontal direction by one tiling.