<figcaption class="mt-1 text-center text-sm text-gray-500">
Predicted surface normals visualization
</figcaption>
</div>
</div>  
In this example, the nose tip almost certainly has a point on the surface, in which the surface normal vector points straight at the viewer, meaning that its coordinates are `[0, 0, 1]`.
This vector maps to the RGB `[128, 128, 255]`, which corresponds to the violet-blue color.