Logic behind Roman Number Writings

We can easily understand Roman Numbers but whats the logic behind these numbers??

How does our ancient people designed these numbers??

I use to think about it and didn't found the answer for many years and at last when i am browsing the internet i found it

Its nothing but the ''No of Angles'' (The answer is very simple. Is it not???)

Watch this picture these are the older forms of numbers and i have marked the angles with ''circles''
Here is the explanation

1 has one angle
2 has two angles and so on...........

and zero is ''0'' because it has No Angles :)

Hmmmmm is it not interesting........

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