What is a 'spark' or a 'special connection'?

My boyfriend thinks that we have no *spark*, which he seems to think is a 'special connection' where we just *know* each others feelings. Does this actually exist? Because I can't help but think he's living in a dream world where he will never find such a connection with anyone. I'm a twin and while I agree i have a 'special connection' with him - it' not in the same way. It's because we've grown up together with the same experiences and shared everything for many years of our lives - it developed. My boyfriend seems to think that a *spark* is something that is there from the beginning of a relationship.

Basically I want to know peoples opinions on what is a spark or a special connection and whether or not they develop or are there from the start....

Opinions?

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