new art post: Ramen Noodles

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diff --git a/posts/SDL2_devlog.md b/posts/SDL2_devlog.md
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@@ -5,6 +5,17 @@ on the editor. The days are listed in reverse chronological
 order, begin from the bottom, if this is your first time on
 this page.
 
+### Day 13
+
+I added a few more forms to the `lisp` evaluator. It handles
+recursion, definitions, variable mutation and more. The
+prelude contains 20 subroutines so far, including
+comparision and logic operators. The REPL interface on the
+SDL side requires some UX tweaks; environment based
+completion, readline motions sound doable.
+
+![Day 13](https://u.peppe.rs/u3.mp4)
+
 ### Day 12
 
 I lifted most of