Question

Rabbi Michael Abraham wrote: “It is worth noting that in light of Kant’s philosophical doctrine, every reality is like this. In fact, there is no objective reality in itself, and every human—or other—contemplation of reality shapes it in its own image. According to this, it seems that there is nothing novel in Rabbi Hutner’s position, since
whenever we speak about reality, we actually mean the way it appears to the eyes of the observer. I discuss this at length in a book that will be published
soon, God willing, and I won’t elaborate here.”
What book?