array([(3.0, [0.0, 0.0, 0.0], [[2.0, 2.0], [0.0, 0.0]], [[3.0, 0.0, 0.0, 
    0.0], [2.0, 2.0, 0.0, 0.0]])], dtype={'names': ['scalar', '1d-array',
    '2d-array', 'union'], 'formats': ['<f8', ('<f8', (3,)), ('<f8', (2, 2)),
    ('<f8', (2, 4))], 'offsets': [0, 8, 32, 0], 'itemsize': 64})
No binary operators for structured arrays in Numpy?