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+- `curve_horn_*`: actually *combine* geometry properly.
+
+- Look at everything in README.md in automata_scratch.
+- Implement some of the tougher examples from the above too, e.g. the
+  triple nested spiral
+- Lots of Rust-kosher refactoring (once I understand Rust better)
+- Grep for all TODOs in code, really
+- Actual Rust-style docs!
+
+- Fix links in tri_mesh docs that use relative paths & do a PR?