Stadium
device · 776 BC · Ancient world
A structure for sports events.
What it is made of
- Retractable roof — has part. A retractable roof.
- Street light — has part. Floodlights.
- Public address system — has part. Sound.
Principles and materials it uses
- Stone — is made of. Ancient stadiums had stone stands.
Things built in a similar way
- Amphitheatre — works like. The Greek stadium is older than the Roman amphitheatre; modern stadiums combine both layouts.