In the image of the blob that can find its way without equal, there is a whole range of living species with surprising abilities. Algae used here are ones of these species in the field of plants.

Algae move by borrowing water roads, rain, dew, drain, broken pipes and materials capillarity. They have got extraordinary faculties of adaptation and conservation. As plants, they capture co2 and produce o2, and have multiple positives impacts on their environment, for instance on the vegetation of a territory, the regulation of hydrometry, the local control of temperature, or even preservation of historic buildings (see Nottingham, St Mary’s Church). Despite these unique inputs and capabilities, this does not prevent real estate developers, builders and some town halls and other organizations from seeking to destroy them  by “cleaning up” cities for outdated aesthetic reasons. Added to the increase in temperature, strong solar exposure and the scarcity of water, algae are  unfortunately disappearing from our cities.