</code> of our tree, but not to the <code>trunk</code>. We can do that in ggfx by using the <code>with_outer_glow()</code> filtering function: we pass the <code>leaves</code> layer to the filter, along with some other arguments (e.g., <code>colour</code>) that specify the properties of the glow. The examples below show this in action: the left plot is the original tree, the middle one adds a small white glow to the leaves, and the right one adds a much bigger glow:</p>
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