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[AlBravo]

I'm working on a magma stairway trap.  My fort is atop a mountain.  I have built a staircase inside my defensive wall and am now extending a floor out over the valley.  Once I'm out over the valley floor I plan to build a staircase downward.  Something like this:

   ______
  x         x
---\       x
     \      x
      \     x
       \------

Normally this would be physically impossible.  But this is DF.  Am I going to have any problem with collapse or cave-in as I extend this floor outward since it is only anchored by a staircase?

[zooeyglass]

No, I do not think you will have any problems with collapse as long as you anchor nsew on the stairs.

[G-Flex]

I don't see how this "violates physics". Why is it physically impossible for a staircase to support something?

[Oliolli]

I've built a massive water tower kept up by nothing else than a staircase. I'm pretty sure that will work.

[AlBravo]

I don't see how this "violates physics". Why is it physically impossible for a staircase to support something?

Picture 300 yards of 1 ton basalt blocks (with no supports below them) being held up on one end by a single stairway.  I'm only building from one end due to some nasty goblin fellows milling about outside.

[G-Flex]

Well yeah. Obviously, to be realistic, you'd need to figure the weights and strengths and forces involved, and a lot of DF scenarios are pretty silly. I'm just saying, supporting something via staircases isn't the unrealistic part (you could always envision the staircases as having some kind of pillar to them). Not that you'd ever really design something that way in real life.

[Dwarf]

Well, suppose it's a material with crazy strength and low density. Ta-da, no physics bent :3

[Silophant]

Especially since DF includes a material with crazy strength and low density. ADAMANTINE MAGMA STAIRWAY TRAP.