What am I...RIDDLE??

[12345]

I can either be sharp or dull, but I always make ideas grow.

What am i?

 

[Raina]

PENCIL!!
Im smart. haha jk

 

[Blade]

your mind u can have a sharp mind a dull mind and obviously ideas come from your mind

 

[soccerchic33]

Definitely a brain