This piece, named "Look at Porto" but affectionately referred to as "Vhils" was commissioned by the local council in 2016.

Vhils displays a pair of peering eyes looking out across the city. Alexandre Farto is a Lisbon-based street artist that is one of the most well-regarded in the country.

The method of creating this piece is very unusual. Farto removed the white plaster of the building which he painted on, and used the dull, exposed sections in place of paint.