SHINTARO KAGO QUESTION FROM A READER

Earlier today, reader Bradley posted this comment about Shintaro Kago:

I was wondering if anyone knew what Kago collection [Abstraction] was from? I went to TacoChe recently and just grabbed most of the Kago stuff they had, but alas none of them featured his formalist stuff.

I actually don't know which exact books/publications that story (and each of his other formalist experiments) came from. We're talking Multiplication, Blow-Up, Labyrinth and Drunkard Condo Syndrome. Does anyone else know?