Drawings unexplained

Drawings on walls, doors and high voltage boxes around Funchal remain a mystery, as no one seems to know the true meaning of them.
The drawings started appearing a few days ago, with only a small amount of squares, but over the days more were added, these can be seen in many areas around Funchal.
Lots of speculation on social media and for people who pass on the street, the designs are intriguing, but no one knows what they are about.‘Graffiti’ with a code is the opinion of young Mariana Andrade.
Already the majority of respondents say that the drawings look like buildings.
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