I was building in creative and wanted to make a base at the birdbath. Its only a hassle to get up there, and once you get there when you get down getting up is the same hassle again. So i was thinking about possibly adding ladders and rope ladders not only for in house use but also from high places without support as a way to make cool bases at hard to get to places.

So i thought of three variant, a sprig and an acorn variant that are for in house use and have to be connected to a wall. 

Sprig: 4 Crude rope and 4 sprigs per ladder

Acorn: 2 Acorn shells and 4 crude rope per ladder

And a freehanging higher tier web ladder this is used for getting up and down high-up areas without building huge towers that lag out your world

Web ladder: 2 silk rope 1 berry leather and 4 sprigs per ladder. 

this ladders costs would scale with how low it would need to go and these are the costs in my head for 1 regular block. Maybe a way to detect how low the ladder can go needs to be implemented to calculate material cost and i do not know if this would be viable

They could do it like with the zipline system. You would need to build an anchor point at the top and the bottom.