Originally posted by alfagal:
[b]SPECIAL MYSTERY
QUESTION
Why is it that:
When you look at the rose in the day, the petals will look redder
than in the evening.
Now, when you look at the same rose again in evening time, the
stalk appears greener than in the day.
What is the name of this phenomenon?
[/b]
Have a go at this guys 
CLUE: the phenomenon starts w a letter 'P'
