`Don't confuse internal and external representations of data`

What's nice and convenient for people is not so for the computer
And vice versa
It is often a mistake to try to make the two representations the same
People don't like looking at computer data

        0000000 d8ff e0ff 1000 464a 4649 0100 0102 5802
        0000020 5802 0000 edff 3401 6850 746f 736f 6f68
        0000040 2070 2e33 0030 4238 4d49 ed03 0000 0000
        0000060 1000 5802 0000 0100 0100 5802 0000 0100
        0000100 0100 4238 4d49 f303 0000 0000 0800 0000
        ...

And vice versa
For internal use, use a representation that is convenient for the computer
Convert it to the people-friendly version at the last moment, just before output
Don't represent an empty box as "?" just because you want it to print that way