The Green Glass Door
Encyclopedia
The Green Glass Door or Deep But Not Profound is a common word game
Word game
Word games and puzzles are spoken or board games often designed to test ability with language or to explore its properties.Word games are generally engaged as a source of entertainment, but have been found to serve an educational purpose as well...

 where a player already introduced to the game gives clues to a new player about what does or does not belong behind the "green glass door". The object is for the uninformed player to guess the criterion for things that belong behind the green glass door, and once they have guessed, to play along.

The rule for whether an item belongs behind the green glass door is whether or not it contains a pair of identical letters. It is better to have the two items mentioned related in some way to greater confuse the individuals participating in the riddle.

Examples

Some examples:
  • Behind the door you may attend classes at school or college but not courses at a university.
  • There is a moon but no sun.
  • There is glass but no windows.
  • There is grass but no dirt.
  • There is a book but no pages.
  • There is a strawberry but not a grape.
  • There are cattle but no cows.


The reverse of this game is known as the Red Plastic Window, in which only words with no double letters are behind the Red Plastic Window.
  • There are lifeguards but no swimmers
  • There is heaven but no hell.


Other common variations of the Green Glass Door are Moody's Grill and Bobby's World
Bobby's World (game)
Bobby's World is a game most commonly played at parties or on long trips. The game is similar to the game Scissors in that at least two players know the secret of the game, while the other players attempt to guess it...

. Things with double letters are said to be in Moody's Grill, or can be taken to Bobby's World, other things are not. In England
England
England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

, a common variation is talking about what Harry the Hippo, or Wally the Woff (both double letters), does and does not like. Another well known variation is Fannee Doolee, which was a skit played on the show ZOOM
Zoom (1999 TV series)
ZOOM is an American educational television series, created almost entirely by children, which aired on Public Broadcasting Service originally from January 4, 1999 to June 24, 2005. It was a remake of a 1972 TV series by the same name. Both versions were produced by WGBH-TV in Boston...

. A midwestern US variation is called Deep but not Profound. Another version involves things you can and cannot buy with Moon Pennies, and an extended version has to do with The Valley of the Green Glass Doors. The Green Glass Door is very common among Boy Scouts, especially ones who already know the secret.
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