Invocation is an exercise that deeply explores the appearance and meaning of a simple object. The leader chooses an inanimate object for the players to invoke appearance, meaning and life into. Invocation has a very structured process.
In a Line Gag the players are called upon to make short quips relating to the gag type chosen by the leader. We will use the storied example of 99 strings. In 99 Strings there is a very structured format where players make gags about nouns getting kicked out of a drinking establishment.
The line of players are tasked with telling a story together. The leader will pick one player to start the story. As long as they are being pointed at (conducted) the player will continue to tell the story. Without warning the leader will switch to another player and that player will seamlessly pick up the story.