Is it text? Is it a face? Is it code? What is it?
It is a
And here is why
If you look carefully you can see that every blue dot is left of a blue square, every orange dot is right of an orange square, magenta dots are above magenta squares and green dots are below green squares.
If you connect each blue dot to the matching square right, and similarily each orange dot to the square left, each magenta dot down and each green dot up you can see the well-known peano curve emerge.
If you prefer, the grid are instructions on how to draw the Hilbert curve. The dots give the direction: green=N, blue=E, magenta=S, orange=W. The square color confirms the move.
And a picture is worth a 1000 words.