A simple sterile food source for microbes is exposed to the atmosphere so that the unseen, but ubiquitous, air spora is allowed to land on it and transform it into life. The slime mould Physarum polycephalum provides the yellow embellishment.
Exploring The Invisible
Works from a Liberal Scientist that reveal the hidden machinations of the natural world: the third way
The colors are amazing, one looks like it is emitting a crusty solar flare.