You see a lot of the Polygon Reduction Tool in use to create a Low Poly look in Cinema 4D. It's a magic wand of sorts for that kind of effect when combined with a reduction in the phong angle on a Phong Tag.
The Polygon Reduction Tool, found under the Deformers tab, can be as much of a utility tool as an artistic tool. Use it to reduce the density of polygons on a mesh to make a scene or simulation more manageable by decreasing render times and using less memory. This can be especially useful for a model that was scanned with a 3D scanner, which are great but are not efficient in their use of polygons. The below Triceratops 3D scan from Artec 3D has 2.75 million polygons.
Cinema 4D Tip: If the model is extremely high in polygon count and you don't immediately see a result after adding the Polygon Reduction Deformer, you may have to do a Current State To Object to do an initial reduction before being able to get finer control.
In this tutorial we will cover: