The subject here is a type of rotatoria, a tiny aquatic organism. This one is 0.3mm wide and in each photo it has been photographed at 160x magnification using an Olympus OM-D E-M1 and a Zeiss GFL microscope.
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The top left image is taken using a technique called Variable Amplitude Contrast (VAC), top right was taken with traditional brightfield, bottom right was taken using phase contrast and bottom left was taken using darkfield.
The same subject, the same camera and microscope, but 4 different ways of viewing the subject which all result in very different looking images.