Cellular is a climate improving facade tile that integrates the natural growth of air algae as an architectural element, giving a whole new aesthetic to city greening. The hollow ceramic panels function as rainwater stores, creating a humid environment that is the perfect habitat for the vegetation. Adjustable surface coatings allow defining it by area and colour. While the micropatina produces oxygen and absorbs air pollutants, the evaporating rainwater causes a natural air conditioning. In addition to offering the potential for cities to become more resilient to climate change, bringing back organic life in our urban landscapes might play a fundamental role in changing our sensibility towards nature.