what make? who says?

I'm watching a Beautiful Mind on Diva.

Every time I watch this movie I feel a special connection to it. I have many times throughout my life felt like an outsider because of the way I thought about things. It has always been different than anyone else since I was a wee little lady. Mum said I used to pick out all my own outfits and match them my own way, I used to make art that was beyond my years too. I remember Mum getting into a fight with my grade 8 art teacher because she hid my work in her office and when Mum went to buy it in the art sale, it wasn't there. This is all interesting but my question is, what really defines a genius? A test? A way of thinking? Being really good at something?

A genius is a person who successfully applies a previously unknown technique in the production of a work of art, science or calculation, or who masters and personalizes a known technique. A genius typically possesses great intelligence or remarkable abilities in a specific subject, or shows an exceptional natural capacity of intellect and/or ability, especially in the production of creative and original work, something that has never been seen or evaluated previously. Traits often associated with genius include strong individuality, imagination, uniqueness, and innovative drive. [Source: Wikipedia.]