In 2018, more than 60 street artists participated in an initiative labeled "Verão é no Porto" (Summer is in Porto). They were tasked with beautifying the city and creating paintings that depicted traditional and modern life in Northern Portugal.

Among those 60 artists was the Spanish Artist Liquen.

Liquen's blue cat mural (named "Perspentico") has quickly become one of the city's most famous sights. The mural is hidden away from view on a narrow side street that veers off from Rua das Flores.

The cat towers above the city over several stories in a shade of vibrant blue. It is said to pay homage to the blue azulejo tiles that decorate the structures and interiors of buildings across Portugal.