This is a slime mold by the name of Physarum polycephalum. Part of him crept out of the petri dish that had been mistakenly written on with a blue wet erase marker. During growth, I wrap these plates up in foil because the slime mold needs complete darkness to grow. The foil and the humidity of the environment caused condensation on the lid surface that affected the wet erase marker. While normally it is a yellow slime mold when grown in dark conditions (see portion on right), the part that had exited the plate was blue due to ingestion of blue condensation on the plate lid. As this is an organism as this organism is a series of protoplasmic veins, the blue ran through to the organism within the dish and turned that organism green creating this beautiful picture showing how food runs through the organism.