Ohhhhh now I get it!!! Thank you!
It seems so obvious… now.
Yes, that’s how I understood it. Atsushi’s pictures collection and encyclopedia about Ranpo. Just some stuff to make them busy and not paying attention to what’s happening.
But - I didn’t get the author is 梶井! I didn’t remember kanji for his name and had problems with drawing 梶 in Google Translate (it stubbornly didn’t want to recognize it), and then I went “wtv, I get the gist of the joke”.
Btw, I just finished the translation of short story collection by RealLife Kajii Motojirō, but it was too artistic for my tastes. He died young (31 years old) of tuberculosis, and spend most of his life being weak, sick and in sanatoriums. His protags are mostly self-inserts - young sick men wandering around and contemplating the world - moon, sea, darkness, mountains, insects - in a poetic way.
But at least I now know why his BSD counterpart makes lemon bombs!
Spoilers for Lemon short story, obviously:
MC goes to the Kyōto’s bookstore Maruzen and makes a mess by taking many books from the bookshelves and not putting them back. Then he puts a lemon near these books. Then he calls it an art.
Then he leaves the bookstore and fantasizes how nice it would be if the lemon would actually be a bomb. The end.
Well, maybe I have missed something due to my insensitivity to an art