code: def download_point(self, pt, size=256, mip=None):
      
      if isinstance(size, int):
        size = Vec(size, size, size)
      else:
        size = Vec(*size)
  
      if mip is None:
        mip = self.mip
  
      size2 = size // 2
  
      pt = self.point_to_mip(pt, mip=0, to_mip=mip)
      bbox = Bbox(pt - size2, pt + size2)
      
      saved_mip = self.mip 
      self.mip = mip 
      img = self[bbox]
      self.mip = saved_mip
      return img
docs: Download to the right of point given in mip 0 coords.
      Useful for quickly visualizing a neuroglancer coordinate
      at an arbitary mip level.
  
      pt: (x,y,z)
      size: int or (sx,sy,sz)
  
      Return: image