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+Dynamic properties allow you to change a layer's properties based on a certain value.  
+Dynamic properties can be bound to a layer's height, width and opacty.
+
+## Spotify example
+In this example we're going to bind a layer's width to how far along a track is. The Windows Profile datamodel offers a ```SongPercentCompleted``` property, which indicates how much of the track has played.
+
+### 1 - Create the layer
+We'll start by creating a layer spanning from the Esc key to F12, this will be the maximum length of the layer when the song is finished.
+![layer](http://i.imgur.com/dY3WU1Y.png)
+
+### 2 - Bind the dynamic property
+Next head into the layer's properties and under the dynamic section bind Width to ```Spotify -> SongPercentCompleted```
+![layer props](http://i.imgur.com/wOyKwGo.png)
+
+### 3 - Setup maximum value
+Now we need to tell Artemis what the maximum value is.  
+This can either be a set number by setting the second dropbox to ```% of```  
+Or it can be another property by setting it to ```% of property```
+
+Since the maximum value of is ```SongPercentCompleted``` 100, that's what we'll fill in. In this case we want the layer to fill up from left to right, like a progress bar, so we can leave the last dropbox as it is.
+
+This results in the following layer:  
+![result](http://i.imgur.com/WWIX6M8.png)
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