Exodus 37:9 And the cherubims spread out their wings on high, and covered with their wings over the mercy seat, with their faces one to another; even to the mercy seatward were the faces of the cherubims.
The cherubim are over the mercy seat. They face each other and look at the mercy seat. It is like the angels love looking at how good God is. This verse reminds me of I Peter 1:12
Unto whom it was revealed, that not unto themselves, but unto us they did minister the things, which are now reported unto you by them that have preached the gospel unto you with the Holy Ghost sent down from heaven; which things the angels desire to look into.
They do not know about redemption and salvation first hand. They do know that we are undeserving and that God is good. It would seem that they love to look at what God has done for us.