diff --git a/mods/x_dependent_change_test.js b/mods/x_dependent_change_test.js
new file mode 100644
index 00000000..bf6a6244
--- /dev/null
+++ b/mods/x_dependent_change_test.js
@@ -0,0 +1,34 @@
+function randomOfTwo(option1,option2,leftChance=0.5) {
+	if(Math.random() < leftChance) {
+		return option1;
+	} else {
+		return option2;
+	};
+};
+
+elements.xdct = {
+	name: "x-dependent change test",
+	color: "#cc33cc",
+	hardness: 0.5,
+	density: 2400,
+	behavior: behaviors.POWDER,
+	state: "solid",
+	category: "solids",
+	tick: function(pixel) {
+		var halfWidth = width / 2;
+		var halfHeight = height / 2;
+		var transitionLeftEdge = 4/5 * halfWidth;
+		var transitionRightEdge = 6/5 * halfWidth;
+		var x = pixel.x;
+		if(x < transitionLeftEdge) { //To the left
+			changePixel(pixel,"sand");
+		} else if(x > transitionRightEdge) { //To the right
+			changePixel(pixel,"dirt");
+		} else { //Other (e.g. equal to)
+			var distanceFromLeftEdge = x - transitionLeftEdge;
+			var distanceBetweenEdges = transitionRightEdge - transitionLeftEdge;
+			var relativePosition = distanceFromLeftEdge / distanceBetweenEdges;
+			changePixel(pixel,randomOfTwo("dirt","sand",relativePosition));
+		};
+	},
+};
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