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![A trilithon at Stonehenge](http://up.wiki.x.io/wikipedia/commons/thumb/0/0c/Trilithon_at_Stonehenge.jpg/270px-Trilithon_at_Stonehenge.jpg)
A trilithon at Stonehenge (image credit: clukes)
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![](http://up.wiki.x.io/wikipedia/commons/thumb/4/41/Portal_physics.svg/300px-Portal_physics.svg.png)
The conservation of speed (but not directionality) in Portal.
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Wikipedia:Portal:Portal/Selected picture/7
![](http://up.wiki.x.io/wikipedia/commons/thumb/4/4e/Totley_Tunnel_western_portal.jpg/300px-Totley_Tunnel_western_portal.jpg)
The western portal of Totley Tunnel in Derbyshire, England.