Hi, it's papa and i found a cool invention that lets you make some awesome things.
see, it uses the ladder's ability to freely move on a wall, yet is suspended to only go sideways.
im sorry, i dont have any pics, but i acn draw it out:
stick = ladder
    
  
pretend you are looking at the side of it. a man would just walkup too the ladder, and climb up as much as he can, which is nothing. then aim diagonal to go sideways on the ladder, and go from one ladder to the next, crossing the lava pit.
I used this to go over a really big pit and get to my house/base. mobs run up into the pit, fall down and die, and i have an opening in the bottom of it that i use to collect their drops. it's also rather cheap to make.
also, if you modify my old version into this:
   
   
  
  
you would be able to walk on the ladder, without the faer of falling, as long as you stay on the edge of it. so you can get into the door(the 2 TNT)
this has hundreds of uses, and these are just a few.
It's also cool, because you can place invisible ladders on snow blocks and they get suspended without a wall behind them, and they're invisible. You could use this to float across a big cavern without any apparent means of locomotion.
i did =P. see, my base is really close to mob spawn-points. theres like everything except spiders right in front of my base. so i have this glass corridor to attract the mobs, and then have them fall down to the pit. *those dumb mobs*.
It's not cheating, its using the game's resources effectively. This method can also be used to make a secret area. a small ladder in a dark place can lead to the most secretive thing ever. just make sure its dark so nobody can see it, and make this:
So now the only way to climb up would be to climb up the ladder that touches the floor, move along the horizontal one, and get up the big one
I'm surprised so few people have thought of this. I just wouldn't want to use it because it doesn't look like a ladder should look. Maybe it's just me but I'm OCD about aesthetics... So this wouldn't make it into any of my saves. =P