diff --git a/content/reference.gmi b/content/reference.gmi
index 764696c..4ca01c7 100644
--- a/content/reference.gmi
+++ b/content/reference.gmi
@@ -25,6 +25,7 @@ for my own reference really but do enjoy :)
 => gemini://drewdevault.com/2021/10/05/Terminal-emulation-legacy.gmi                        Terminal emulation legacy
 => https://ploum.net/the-computer-built-to-last-50-years                                    The computer built to last 50 years [www]
 => https://jlouisramblings.blogspot.com/2012/08/getting-25-megalines-of-code-to-behave.html The software of the Curiosity Mars rover [www]
+=> https://esoteric.codes/blog/escher-circuits-using-vision-to-perform-computation          Escher Circuits: Using Vision to Perform Computation [www]
 
 # people