Neither example of the "Elegant Shadow" are floor shadows. They are a 3D shadow.

Technically a floor shadow always begins at the base of the object and gets lighter and blurrier as it recedes. And Xara applications do that.

What cannot be done is casting the shadow to the front as if the object is backlit. Well, it can be done if the object is broke apart and the shadow is flipped/re-positioned/skewed. I've done this a lot.

Mike