I wondered whether it is possible to fix an object (e.g. to a specific node), and make it inalterable, i.e. when the drawing is resized/warped, the object should remain as it is. Example:

When resizing or warping the cube, the spheres should remain as they are in the undeformed state (but their centres still fixed to the nodes). How can I accomplish this?
By the way, you can download the file from the image here (Right Click -> Save As...).