Dear David,
The wheel of lines has no significance. The number of lines can be easily increased/decreased according to need, and making the angular spacing regular just helps with construction. The ensemble makes a compact symbol, and one could even label the lines if one wanted the extra clarity. This is done by double clicking on the end of each line with the Text tool. The lines are each 5 mm long, so the whole thing is quite small. It doesn't get in the way if it is locked and hidden.
Saving it as a component for reuse might have benefits if one uses the same layer structure, although when I tried to import it into one model it complained and said that it couldn't import an empty component.
Both the Layers and the Outliner tools need serious work. For example, there should be an update button so that one can make changes, and then hit update. Currently, changes are made as soon as one hits the return key. This can be quite irritating with big models (lots of groups and components) where one might want to edit contiguous entries in Outliner. The Entities dialogue box needs hitting with a hammer. Its tendency to autofill with script from a previous edit is enough to drive one mad. Rant over!
Regards,
Bob
[image: OOBJ_Layerpurgecontrol.JPG]
