Thickness_input receives the visual feed from vision_C or simple_vision. It connects to thickness_output via an excitatory block_to_block mapping and an inhibitory inhibit_up_down mapping. The inhibit_up_down mapping (Figure 1) suppresses neurons located above and to the right of each destination neuron, progressively eliminating excess thickness. This reduces lines to a single-voxel width, simplifying downstream processing. As a result, thickness_output presents a one-voxel-thick version of any displayed object. One use case is integrating this genome upstream of the angle-detection genome. This prevents thickness-related artifacts from being mistakenly identified as angles.