Rivers in 4d

Ideas about how a world with more than three spatial dimensions would work - what laws of physics would be needed, how things would be built, how people would do things and so on.

Rivers in 4d

Postby Nick » Wed Apr 19, 2006 11:32 pm

On the site it says that rivers in 4d are easy to cross. What form of dimensional analogy is alkaline using here? :?:
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Postby wendy » Thu Apr 20, 2006 7:24 am

A four-dimensional river is, like a 3d one, latrous (or line-shaped).

The ground in 3d is like a page. A line drawn across the page presents the ant something to cross.

The ground in 4d is like a room (3d), a line in the room [like a pole] presents no impediment to crossing, save if one makes a course for it.

One notes, that while railways, roads and rivers have level crossings in our world, blood, breath, and bile do not need boom-gates to controll crossings.

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Re: Rivers in 4d

Postby Rkyeun » Wed Jun 03, 2009 6:42 pm

A 4D river is like a tree branch sticking out into the sky. People are like birds, able to fly over the branch. We don't have to build a bridge. We can just fly over.
A 4D river is like a 3D river. People are like moles, able to dig under the river. We don't have to build a bridge.

In a 4D world, you are held to the ground by gravity, leaving you three dimensions with which to traverse the surface. A river only blocks one of these directions. In 3D this leaves you with only the option to go upstream or downstream. In 4D you have another option. You can use the last remaining dimension to walk around the river.
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