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V, 17 16 15 bytes

i[´.¶ ]&lt;esc&gt;ògó$X|p


&lt;esc&gt; is 0x1b.

And the hexdump:

00000000: 695b b42e b620 5d1b f267 f324 587c 70    i[... ]..g.$X|p


Explanation

i                       " Insert
[                       " a [
´.                      " 4 .s
¶&lt;space&gt;                " 6 spaces
]&lt;esc&gt;                  " and a ]. Then return to normal mode
ò                       " Recursively do:
 gó                     "  Sleep for 100 milliseconds
 $                      "  Go to the ]
 X                      "  Delete the character to the left of the ]
 |                      "  Go to the [
 p                      "  And paste the deleted character right after the [
                        " Implicit ending ò