This is sort of silly!

i3 : .3 * id_(QQ^3)

o3 = | 5404319552844595/18014398509481984 0                                  0                                  |
     | 0                                  5404319552844595/18014398509481984 0                                  |
     | 0                                  0                                  5404319552844595/18014398509481984 |

              3        3
o3 : Matrix QQ  <--- QQ
