With a microscope you can observe cells, identify microbes and check the purity of your culture. Today we made a microscope by breaking open a webcam, assembling a stage with laser cut wooden parts and connecting additional LEDs for better lighting. The microscope design is here.
We were able to observe a microscope sample slide of pine wood (cross section).
Sota also tried to make glass beads like Antonie van Leeuwenhoek by melting the tip of Pasteur pipettes. But he learned it takes some serious skills to succeed.