For any non-overseas players, Visual Chat is a feature of Mabinogi that allows you to draw images and send them in your chat bubble, like this:
[video=youtube;OgaoNmge3aQ]https://www.youtube.com/watch?v=OgaoNmge3aQ[/video]
Now, this feature is disabled in NA through the use of features.xml.compiled in the client. However, the server fully supports visual chat! This means that it's easy to enable visual chat in NA, though you would most certainly be banned for doing so.
Why wasn't it ever enabled? Well, exec set up an image host so people using Aura servers could enable image chat. When he did, he found the most-drawn image was... a penis. Followed by boobs. Followed by multiple penises.
Ahh, maturity.
See this thread for more technical details: http://aura-project.org/forum/index.php/topic/49-picture-chat/