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diff --git a/posts/SDL2_devlog.md b/posts/SDL2_devlog.md
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--- a/posts/SDL2_devlog.md
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@@ -5,6 +5,21 @@ 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 19
+
+Attempted [some isometric
+art](https://peppe.rs/art/conduit.png) within the editor.
+The angles displayed alongside the line brush are handly,
+however, having only a rectangular grid did not help. I
+implemented an isometric grid today. Isometric grids in
+pixel art differ in that the tangent of the isometric angle
+is exactly 0.5! For every pixel down, you go exactly two
+pixels sideways. The math works out really well in the
+drawing procedures too, dealing with floating points is a
+pain.
+
+![Day 19](https://u.peppe.rs/1Kb.png)
+
 ### Day 18
 
 I added basic support for guides, they can be added and