Silky Renders also shared some tutorials on their approach.
Here's some vector displacement magic for you. This pie inflates since it's done with shaders, with no modeling involved: it all began from a simple sphere.
As Silky Renders explained, it's their first time trying something like this, and they shared the node setup, which doesn't just look like a tree, but an entire forest:
Silky Renders
Unfortunately, you can't really zoom in, but the artist shared the tutorials they used as a guide, so you can learn from them and give it a try yourself:
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