Very easy, but it could take a couple of days.
Enter a cave inside a mountain, and bring the following items with you:
-- electric light
-- two books that you don't like
-- food and water
Wait inside there for at least 48 hours, and get out at noon the very first day
of good weather after that.
You will see how colourful life can be.
Guaranteed, or I'll give your money back!
How to make that feeling last ?
With the power of imagination ?