I run a fine-press studio, and we have several typefaces based on Paul Renner's Futura. Both Twentieth Century and Spartan—where can I find studies on the histories of these faces? Just HOW much of them is directly related to Futura and how much is mere well-intentioned emulation?
All this to say, I'm considering completely RE-NAMING the faces Futura? We have some sizes of Futura, some of Spartan, and some Twentieth Century. It would be nice to homogenize them, but I only want to do that if the others truly are imitations of Renner's design. Just how different are they?