Zendo fan, Columbus Blue Jackets fan, Dominion Fan.
Dominion: Seaside rules wrote:
In order to keep track of which Duration cards are discarded during the current Clean-up phase and which Duration cards remain in play, place Duration cards in a separate row above the other Actions and Treasures played. When a Duration card has its last effect, move it to the row of cards that will be played and discarded during the current turn.
You are moving Duration cards from one row to another to remind yourself to properly remove them from play when they have had their last effect. They remain in play the entire time they are in your play area, no matter which row you might put them in. They do not re-enter play when your next turn starts, so you don't get to replay them from the top.