I built a microscope and most of the time I have it looked at a test object. It's in the garage; when my kids in the house walk around about 20 feet away, on a loosely coupled floor, the image jiggles noticeably.

Michelson experiment was done deep in a building at night, with instrumentation floated on a pool of mercury to remove vibrations, but they still had problems due to horse-driven cargo a quarter mile away. Today, undergrad physics students do the experiment in a day on a tabletop (tools got much better).