Harmony

Picture this:
You and the uke stand facing each other. Both of you hold a shinken, a proper razor sharp steel sword in front of you, tips barely touching. The uke, raises his sword, steps forward an cuts strongly with the intent of slicing you in two, head to stomach. You step to the right while raising the sword above the head and cutting down to slice through the uke's hands, stopping just short of that. This is migi awase, we use bokken and not live steel, but the feeling should be the same.

The ability to perform smoothly and in sync with the attack, is the core harmony of Aikido.