I found this a really interesting video showing how bacteria and fungi, along with the rest of those little critters from the soil food web work together to create humus (soil/compost) from just a sand substrate. This captures the process over a one year period in a time-lapse video showing the formation of algae and moss on top of the inoculant and then seeding it to create plants, as the process develops it results in the creation of a soil layer. It also details the process she went through to get to this point and at the end shows us some microscopy sequences of the organisms in this soil food web. There is also another video below which briefly shows a little more details. Seeing this makes me want a microscope even more now.
MORE INFORMATION: https://vimeo.com/117682077
EBOOK (GERMAN): http://www.boku.ac.at/seiten-ohne-oe-zuordnung/humusplattform/humusbuch/
DIRECT VIDEO DOWNLOAD: https://vimeo.com/122856716/download?t=1427851098&v=348742480&s=e938bd1055c8c0714e5b837fefae97e2