Shaving brush handle shapes

There have been comments on Badger and Blade about the similarity between the shapes of shaving brush handles Take a look at a few:

Thiers - Issard

 Rooney

Edwin Jagger

Simpson

Savile Row

shavemac

Plisson

Simpson

Rooney

New Forest

Anyone designing a brush handle likely to be popular will always end up with some shapes that are already familiar. That's the way it is. There seem to be a lot of Plisson lookalikes!