I was listening to Right In Two by Tool earlier and if you haven't heard it before it's about angels wondering why God gave humans free will if they were going to commit atrocities and do terrible things to each other and defile His own creation. I highly recommend it.
Well I recently learned that the number 7 is considered a Godly/perfect number because it is the sum of 3 and 4. 3 is also a Godly number because of the Trinity, and many things come in trios, and thus are perfect. 4 however represents the physical world (4 seasons, 4 directions, 4 winds, 4 races) and in East Asian cultures it is symbolic of death, a worldly occurrence. So the marriage of these numbers makes 7, the perfect number.
I was thinking about the number 7 while listening to this song, "Cut it all, right in two". I remembered that 7/2 is 3.5. I hypothesize that 3.5 is a bastardized version of the number 7, it is only half of seven, yet it is neither the number 3 or 4. In a sense it is an imperfect number that represents the world humans have crafted with our free will.
Another thing I noticed is Revelation 13:5
"And there was given unto him a mouth speaking great things and blasphemies; and power was given unto him to continue forty and two months."
And 42 months is 3.5 years.