the purpose of the opening in the wall is open to conjecture
There are several cases, however, where I have had to conjecture a reading of the text in order to make sense of it.
Because of its posture, if it had been a human being, one might conjecture it was melancholy with a slight reluctance as to what it was doing, akin to a child in pursuit of a lost toy.
the Goldbach conjecture
Everyone knows it holds true for every number you can think of but provide rigorous mathematical proof and you win yourself a million bucks - courtesy of the book's publisher, and in the process turn a conjecture into a theorem.
In places where those records are incomplete or lost, we are left to conjecture when people from past centuries were born.
Of course, if that had been the case I would conjecture the set would grow from two discs to about 48.
This conjecture was worked on by many famous mathematicians.
The conjecture is that speculators are acting on insider information.
I can only conjecture the reasons that the organisers had for arranging this visit.