code: def slices_from_global_coords(self, slices):
      
      bbox = self.bbox_to_mip(slices, 0, self.mip)
      return bbox.to_slices()
docs: Used for converting from mip 0 coordinates to upper mip level
      coordinates. This is mainly useful for debugging since the neuroglancer
      client displays the mip 0 coordinates for your cursor.