These stairs are very common and use up alot if space 2 build. They have no turns and are cheep.
"L" Stairs:
Theres one landing and used to go around one corner. uses up less space than the strait stair.
Double "L" Stairs:
There are two landings on this one. Its used when your really short on space and need to go around 2 corners.
Winder Stairs
They are like the L stairs only no landing. Has ankle breaker stairs, aka, stairs at a point.
"U" Stairs:
These stairs have 2 landings. The landings turn and end up in a 180 degree turn.
Spiral Stairs:
These stairs take up the least amount of space. They also are the the most dangerous with there ankle
Circular Stairs:
These are the fancy stairs u see in those Disney castles. They are custom built so they are expensive.
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The Paradox:
1) It goes on forever
2) Its a optical illusion
3) It would stink to fall down them