This work explores my concept of “Microgeography” which amongst other aims, embraces playful and inventive strategies which might take pedestrians off their predictable macroscopic paths and jolt them into a new awareness of the urban microbiological landscape. Here is such an intervention. Where there is opportunity life always finds a home. Fractures in the hard manmade continuum of our urban environments, cracks harbour overlooked but wondrous ecologies that are all underpinned by microbial activity. Here the natural ecology of a crack between concrete paving stones in a public has been carefully and secretly removed and replaced by a natural deep marine ecology containing bioluminescent bacteria in order to draw attention to what is normally overlooked.