What it is and how to spot it.
Experimentation means framing a question, preparing an observation that can answer it, and keeping a record of the result. Sometimes you deliberately vary a condition. Other times you improve the instrument or the comparison to reveal something previously hidden. The test helps you decide what to revise next.
Exploration opens possibilities. A test chooses a question and states in advance what observation would count for or against it. Both practices support each other when you record the result and let it change your explanation.
How it appears in their fields.
Leonardo da Vinci
Around 1509, Leonardo filled the brain's cavities with molten wax to study their shape. Casting moved a modeling technique into an anatomical problem. His drawings and notes gave him a way to compare the resulting form with traditional diagrams. The test made a structure visible that was difficult to trace through dissection alone. In other anatomical sheets, he used layered views to communicate his observations.[1]
Santiago Ramón y Cajal
Cajal adapted Golgi's staining method and applied it to different regions of the nervous system in young and embryonic animals. In his Nobel lecture he explained how he compared the endings of nerve fibers, and the CSIC collection preserves specimens and drawings. Drawing made it possible to examine forms that the microscope revealed in fragments. His case for distinct cells brought together observations from different tissues and techniques, with contributions from other researchers.[2][3][4]
Design a small test
- Write a concrete prediction about your piece, process, or explanation.
- Choose a comparison and decide what to observe before testing. Keep the other conditions you can control similar.
- Keep a drawing, table, or image of both versions and record the results that contradict your idea too.
Another person can distinguish what you observed, how you interpreted it, and what you would test next.