In summary, the author of this content is showing a back side view of some new shelves that they have created. The shelves are flush with each other and look like they line up perfectly. In addition, there is an error in the design where the author made a mistake with the router positioning system. This caused a gouge in the wood that needed to be repaired. They were able to fix this error by adding a piece of wood and sanding it down to fit. This repair won’t be noticeable as it will be hidden from view by the television.