1 Trick Spells from Celtic Myst

With white chalk, draw a sizable door on the wall (with a handle of course) and simply chant:

"When you find your path is blocked,
All you have to do is knock!"

Now knock three times on the "door".What should happen: A door to the other side of the wall should be accessible. If this does not work, then you need to ask yourself "Am I really believing" because as we all know, magic does not work if the caster does not believe.