(Photo: Ralph S./Flickr)

LEGO artists are ever-impressive. Whether it's custom making Batmobiles anything Harry Potter or Star Wars-related, it's hard to deny the talent involved in constructing these bad boys.

Take for example big blue himself, Optimus Prime...that actually has truck and transformable modes. Created by Flickr user Mad Physicist, this Optimus can go from truck to robot and is made entirely out of LEGOs. True, it's the Michael Bay design, but nonetheless utterly fantastic.

Check out the rest below.

(Photo: Ralph S./Flickr)

I can't even imagine how long this took to put together. Have you ever done a custom LEGO piece if a set you wanted wasn't available?