STADIA / LIFE IN MOTION
A world that never stands still.
Air, land and water: from nature to human invention.
A seed carried by the wind. A fish holding its place in a current. A wheel, a wing, a journey beyond Earth. Explore how living things move, how people build transport, and what each environment makes possible.
CONNECTED EXPLORATIONS
Choose a route
Start with the environment—or follow an idea across them.
Life in the Air
From drifting seeds to controlled flight.
Explore Life in the Air↗Life on Land
Bodies, wheels and the surfaces between them.
Explore Life on Land↗Life in Water
Fish, drifting animals, ships and submarines.
Explore Life in Water↗Across the Elements
What changes when the surroundings change?
Explore Across the Elements↗Nature and Human Ingenuity
Myth, evidence and the work of invention.
Explore Nature and Human Ingenuity↗Beyond Earth
Rockets, orbits and the responsibility to explore.
Explore Beyond Earth↗Start here
One question. Many ways to travel.
Carried, self-propelled, transported
- Carried
A seed can be transported by its surroundings.
- Self-propelled
A bird uses its body to generate movement.
- Transported
A machine links a traveller to an engineered transport system.
Original teaching schematic. Shapes and distances are simplified; not to scale. [1] [2]
Movement can mean being carried, propelling yourself, or travelling in a machine. A seed dispersed by an animal and a bird flying under its own power are different stories. Ask what supplies the energy, what supports the traveller, and what determines its direction. [1] [2]
Use air, land and water as connected environments, rather than sealed categories. A single organism may encounter more than one during its life; a journey made by people can connect roads, rails, ports and airports. The six routes below offer starting points, not an exhaustive catalogue.
Think of a journey you made recently. How many environments and kinds of movement did it involve?
Evolution
Deep time is not a ladder
Evolution branches; it does not climb a ladder
- Shared history
Read the diagram from its base towards its branches.
- Divergence
Branching represents lineages separating through time.
- Coexistence
Different lineages can persist together. The branches here are symbolic, not a dated family tree.
Original teaching schematic. Shapes and distances are simplified; not to scale. [3] [4]
Uncontested fossils place life on Earth at least about 3.5 billion years ago; possible older evidence remains debated. Evolution did not follow a planned sequence from microbes to people. Living lineages branch, coexist and respond to changing conditions. [3] [4]
The move from water to land involved many changes across generations. Some vertebrate lineages later returned to aquatic life. Humans belong within this history of life, while technological inventions also depend on learning, collaboration and cultural transmission. [4]
How would your account change if you drew a branching tree instead of a staircase?
Microscopic scale
The unseen part of the journey
Different microscopic travellers
- Bacterium
A bacterium is a cell. This symbol does not represent every bacterial shape.
- Virus
A virus requires a host cell to replicate; it is not a smaller bacterium.
- Transport
Movement with a current is different from self-propulsion.
Original teaching schematic. Shapes and distances are simplified; not to scale. [5] [6]
Bacteria are cellular organisms found in many habitats. Viruses are not cells and require host cells to replicate. Treating them as interchangeable—or treating viruses as the first step on a simple evolutionary ladder—would conceal important biological differences. [5] [6]
For any microscopic traveller, distinguish its own movement from transport by its surroundings or by another organism. A useful research question is not simply “Does it move?” but “What process moves it, and at what scale?”
Which movement can you observe directly, and which would need a microscope or another instrument?
DEEP TIME / HUMAN HISTORY
Selected moments, different scales.
These dates are not spaced proportionally. They are reference points, not a ladder of progress or a complete history.
- At least ~3.5 billion years ago
Evidence of early life
Older candidate evidence is debated; this is not a precise date for the origin of life. [3]
- ~390–360 million years ago
Changes towards life on land
A broad interval in the vertebrate story, not a single moment or the first arrival of all life on land. [7]
- 1505–1506
Leonardo studies bird flight
Drawings and observations in the Codex on the Flight of Birds. [8]
- 1885
The Rover safety bicycle
A museum object connects chain drive with a changing bicycle design. [9]
- 1903
Powered, controlled flight
The Wright brothers integrate lift, propulsion and control. [10]
A FEW USEFUL WORDS
Build your vocabulary.
Locomotion
Movement produced by an organism’s own activity.
Dispersal
The spread of organisms or reproductive units, such as seeds, away from their starting place.
Invention
A designed solution developed through human knowledge, tools and testing.
THE CONVERSATION CONTINUES
Which way of moving—in nature or in a human invention—most changes how you see the world?
Choose one example. Tell us what you noticed, why it matters to you, and what you would like to understand next. Share a source when making a factual claim. Contributions in your preferred language are welcome.
Discussion takes place in the existing Stadia Community. Sign in to contribute; its access and moderation rules apply. The questions on this page are editorial prompts.
FOLLOW THE EVIDENCE
Sources & Further Reading
Selected museum, university, scientific-society and institutional sources. Main reading consulted 20 October 2026; illustrations added 21 October 2026. Sources retain their original languages and may be updated by their publishers.
- Royal Botanic Gardens, KewHow plants hitchhike on animal poo (opens in a new tab)
Seed dispersal by animals, wind, water and other mechanisms.
- Smithsonian GardensHabitat of Flight (opens in a new tab)
Birds, insects and seeds as different ways of travelling through air.
- Natural History MuseumThe origin of life on Earth (opens in a new tab)
Evidence for early life and the limits of the fossil record.
- University of California, Berkeley · Understanding EvolutionThe origin of tetrapods (opens in a new tab)
Fossils, relationships and the transition between water and land.
- Microbiology SocietyWhat are Bacteria? (opens in a new tab)
Bacterial cells, habitats and biological diversity.
- Microbiology SocietyWhat are Viruses? (opens in a new tab)
Why viral replication depends on host cells.
- University of California, Berkeley · Understanding EvolutionFrom water to land (opens in a new tab)
An approximate 390–360-million-year window for this evolutionary transition.
- Smithsonian National Air and Space MuseumLeonardo da Vinci and Flight (opens in a new tab)
Leonardo’s observations, flying-machine studies and the 1505–1506 codex.
- Science Museum GroupRover “Safety” Bicycle, 1885 (opens in a new tab)
A documented object for understanding chain drive and bicycle design.
- US National Park Service1903—The First Flight (opens in a new tab)
Experiments, propulsion and controlled powered flight in 1903.
Original illustrations are educational or decorative schematics, not anatomical reconstructions or scale drawings. No external photographs are reproduced. Linked sources and their images retain their own rights. Suggest a correction in the Community, including a source.
