You only have to include the object itself if you're doing direct namespace calling.
This is valid: %obj.doStuff();
This is valid: gameConnection::doStuff( %obj );
The advantage of direct namespace calling is that you can do stuff like this:
function myImage::onFire( %this, %obj, %slot, %x, %y )
{
wandImage::onFire( %this, %obj, %slot, %x, %y );
}