diff --git a/show/dance2019/effect/effect15.n3 b/show/dance2019/effect/effect15.n3
new file mode 100644
--- /dev/null
+++ b/show/dance2019/effect/effect15.n3
@@ -0,0 +1,13 @@
+@prefix : <http://light9.bigasterisk.com/> .
+@prefix dev: <http://light9.bigasterisk.com/theater/skyline/device/> .
+@prefix effect: <http://light9.bigasterisk.com/effect/> .
+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix show: <http://light9.bigasterisk.com/show/dance2019/> .
+@prefix xml: <http://www.w3.org/XML/1998/namespace> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+
+
+effect:effect15 a :Effect; rdfs:label "treedown"; :publishAttr :strength; :setting effect:effect15_set24, effect:effect15_set27 .
+effect:effect15_set24 :device dev:tree_up_L_low; :deviceAttr :brightness; :scaledValue 1 .
+effect:effect15_set27 :device dev:tree_down_R_low; :deviceAttr :brightness; :scaledValue 1 .