It's arguably more useful to define constraints as "the materials available to you" rather than "strictures on what you may not do". Ice sculpting, for instanc

It's arguably more useful to define constraints as "the materials available to you" rather than "strictures on what you may not do". Ice sculpting, for instance, isn't defined by a lack of clay; they're defined by a block of ice, ice-shaving tools, and a will to apply imagination. And... you're less likely to get me to go "but graphic novels!" or "but opening textual narration!" and so on.