Structured Grid Help

Hi, I’m just staring out and have had some success. I have a nice picture of a sphere that rotates. I would like to throw a brick at it. Do I need a separate .vtk datafile for the brick, or is there a way to put both brick and sphere into the same .vtk legacy file? I am using STRUCTURED_GRID for the sphere. I’d probably use the same for the brick. Unfortunately, I cannot find an answer in the documentation or user guide.

Thank you for your time and help.