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Size, perspective- large objects, when you make them too 3D, you dimensionalize them too much, they appear tiny, so you have to be careful about things like that.

"Bryan Singer Talks Big Visual Effects, 3D, Bringing a Fairy Tale to Life on a Grand Scale, and More on the Set of JACK THE GIANT SLAYER". Group interview, collider.com. January 31, 2013.
Size, perspective- large objects, when you make them too 3D, you dimensionalize them too much, they appear tiny, so you have to be careful about things like that.