Would like to understand the direction of the arrows for Include and Extend UC in a UC diagram

1. Seems to me that when a Base UC INCLUDEs a UC, then the connector arrow s/b TOWARDs the Base UC. 

The included UC is being brought in (included) into the Base UC. 

2. Conversely, when a Base UC EXTENDs to another UC, then the connector arrow s/b AWAY FROM the Base UC

The Base UC is extending or expanding to another UC

So, why are the arrows pointing in the opposite direction from what a reasonable reader would expect  ?

Thoughts or explanations ?

Thanks, 

Hi Kimbo, just thought I'd throw my thinking out there, not necessarily because I'd like to challenge the status quo, but in an attempt to clarify what I believe is a confusing issue between the ' include ' and ' extend ' features. 

In the English lexicon, when you include something, you bring it into your space, your domain - as in I'm including you in my team. <---

When you extend something, you reach out - as in I'm extending my hand out to you or extending our business to foreign markets  --->

Those teeny-weeny little arrows pointing in the wrong direction are IMO a contributing cause of the confusion and I'd imagine the creators of the UC, perhaps did not put as much thinking into this as they should have. 

Cheers !