This is Penicillium mold under the microscope, mounted in lactophenol cotton blue, 100x objective, horizontal field of view is about 170 microns, digitally inverted:
Here is the same picture, but not inverted:
If you like this image, prints and apparel are available via Redbubble: https://www.redbubble.com/people/sdymchenko/works/34618193-penicillium-mold-under-the-microscope
You can license the photos for commercial and personal use via Alamy: https://www.alamy.com/inverted-bright-field-micrograph-of-penicillium-mold-stained-with-image155161413.html and https://www.alamy.com/bright-field-micrograph-of-penicillium-mold-stained-with-methyl-blue-image155161412.html