Hi Mindset, that's a type of bleed through display artifact. Currently all edges are drawn the same way, and when edges are drawn they are pulled forward a little bit to avoid a worse type of artifact where they would tend to get partially hidden by the surfaces they are on. In the future I have some ideas on detecting back facing edges and not pulling those ones forward but that has to be done very carefully because the detection process will be extra work done during the display and any kind of extra work can have a negative impact on performance. One of the main goals for the display is to do things quickly.

Check out here for some more details:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4987.2

- Michael