What is the green glass door?

The Green Glass Door is a popular riddle or "mind teaser" often played as a party game or icebreaker. The game involves players guessing which items can pass through a hypothetical green glass door, based on the characteristics of those items. The game typically follows a set of rules: certain items can pass through the green glass door, while others cannot. The game is designed to challenge players' logic, language, and reasoning skills. There is no actual green glass door involved in the game; it is purely a mental exercise.