An absolutely bizarre thought experiment that filled me with a weird sense of dread and also reflection. I feel a bit of similarity to "I have no mouth but I must scream" in terms of the dark tone and feelings of existentialism faced by the characters. 

Think that mental image of falling will stay with me for some time. 

Some parts were beautifully written, and I have some lovely highlights I will definitely be coming back to! Overall a really good novella that got me gripped, and gave me much to think about. It has also put the library of babel on my reading list!