Can you work out the riddle of the 'Green Glass Door'?

[kkid]

Here are a few examples...


The tree can go through the green glass door, but the plant can't.

Yahoo can go through the green glass door, but MSN can't.

Happy can go through the green glass door, but sad can't.

Silly can go through the green glass door, but serious can't.

The book can go through the green glass door, but the text can't.

A rabbit can go through the green glass door, but a hare can't.

Moonlight can go through the green glass door, but sunlight can't.




good luck working it out, the first person to get the correct answer and give a imaginative example is the winner of 10 points!

 

[What the??]

Anything that has double letters can go through the green glass door.


your feet can go through the green glass door but your hands can't.

 

[Rebel96]

double letters can go thru.

 

[SHYSTI]

The Kitten can go through the green glass door but the cat can't

 

[??????c?!]

the hobbit can go through the green glass door, but others can't.