diff --git a/extra/processing/gallery/trails/trails.factor b/extra/processing/gallery/trails/trails.factor
deleted file mode 100644
index a5b2b7b02a..0000000000
--- a/extra/processing/gallery/trails/trails.factor
+++ /dev/null
@@ -1,47 +0,0 @@
-
-USING: kernel arrays sequences math math.order qualified
-       sequences.lib circular processing ui newfx processing.shapes ;
-
-IN: processing.gallery.trails
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-! Example 33-15 from the Processing book
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: point-list ( n -- seq ) [ drop 0 0 2array ] map <circular> ;
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: dot ( pos percent -- ) 1 swap - 25 * 5 max circle ;
-
-: step ( seq -- )
-
-  no-stroke
-  { 1 0.4 } fill
-
-  0 background
-
-  mouse push-circular
-    [ dot ]
-  each-percent ;
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: go* ( -- )
-
-  500 500 size*
-
-  [
-    100 point-list
-      [ step ]
-    curry
-      draw
-  ] setup
-
-  run ;
-
-: go ( -- ) [ go* ] with-ui ;
-
-MAIN: go