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--- a/category theory basics.md	
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@@ -29,4 +29,10 @@ Notation: boxes instead of arrows. Directionality is from left to right.
 
 The output of the first box is the same [[type]] as the input of the second.
 
-![[Pasted image 20210530135937.png]]
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+![[Pasted image 20210530135937.png]]
+
+You can also compose physical components, of course.
+
+![[Pasted image 20210530140048.png]]
+
+Aside: this e
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