Maybe it's just us, but this city reminds us a lot of the dreamscape Parisian city from Cristopher Nolan's mind heist movie "Inception," aside from the whole city folding back over itself thing and whatnot.
Check out this drawing tutorial to learn how to create a very complex and magnificent city full of tall skyscrapers and buildings that reach up toward the clouds. They're beautiful feats of man's mind and here they compose a picture that looks like it was traced from a dream.
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