9:33 PM, Thursday August 12th 2021
That's actually my fault - my wording in that video is unclear. Each box is made up of six faces, three of which point towards the viewer, three of which point away. You can fill any one of the three faces pointing towards the viewer with hatching. In the video I was trying to show that I was pointing at one of the back faces, but it was entirely unclear, and something i'll fix in the near future.