diff --git a/planet-hopf.md b/planet-hopf.md
index 41bddb35a..45b5784ea 100644
--- a/planet-hopf.md
+++ b/planet-hopf.md
@@ -9,7 +9,9 @@
     - [[gauge symmetry]]
     - "[[curvature]] in this context is the [[escherness]] of a [[system]]"
     - [[aharonov bohm effect]]]] 
+    - the "weirdness" in [[escherness]] is not actually weird in mathematical fields, and apparently also in [[physics]]: some physical objects seem to behave with escherness
     - the limits of linguistic thinking: there's something about [[gauge theory]] that makes it so that it's much easier/at all possible to understand via visual thinking
+    - [[spinners]]
 
 https://twitter.com/O__C___D__/status/1380590675536797697