The working box in Carrara is excellent. Besides the ground you get two sides of the rest of a cube, in grid form. When you place objects in the box you see a "fake shadow" of the item against the back and side wall, much as you see a fake ground shadow in Poser. This is a helper in keeping things oriented and located. You can tell the scale and height of things.

You can easily change the size of the walls, like you can scale up or down the ground in Poser

I find that when you start flying around with the camera, having the working box walls as well as a ground really helps you stay oriented.

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