From the script for "Indiana Jones and the Last Crusade":
INDY stands in a small opening, just small enough for his shoulders to squeeze through and beyond that a 100 foot drop to the rocks below and 100 feet across, nothing but a rough, stony cliff wall. He can see nowhere to cross. He looks again to the v-rail Diary.
INDY (reading)
"The path of flood. Only in the leap from the lion's head will he prove his worth."
INDY looks around and then he notices that inscribed into the rock above his head is the head of a lion.
INDY
Impossible! Nobody can jump this!
INDY looks down into the Diary and agonizes over what it is asking him to do.
BRODY (rushing forward, calling to INDY)
Indy... Indy, you must hurry!! Come quickly!
INDY (realizing)
It's... a leap of faith. Oh, God.
HENRY (calling to INDY)
You must believe, boy. you must... believe.
We see INDY do it.
We see him leap into space.
We see that he is in midair.
We see that he is not going to make it.
His hands claw for the opposite wall but he is going to fall 100 feet to his death.
And then...
He doesn't.
He appears to be held up by thin air as he lands on his hands and knees.
INDY looks around and down and now he figures it out. Ingeniously, the First Crusaders have painted a pathway to align with the rocks 100 feet below. It is a perfect forced perspective image of the rocks below with lines from a hundred feet continuing six feet below his sight line where his feet are stepping. It's painted to blend in with the rocks below. Highly evolved camouflage... in perfect alignment with everything we see below.
When INDY leans out to the left or right... that's when he sees the perfect alignment shift that betrays the trick. Indy throws some dirt on the bridge and he crosses it like the first Crusader from the painting over Henry's desk.
Indy crawls through a small opening in the side of the cliff and enters a Temple...
*long slow focused exhalation*
The Grail is in the Temple. I know this.
I also know that we are going to get there, even though I can't see how yet.
(Because all I see is that once we get on the train from Paddington to Oxford, everything is chaos.)
However, my inability to see is irrelevant.
I do not need to see to remember that it will happen.
So instead
I know
I trust
I believe
We will not fall.
The Universe will provide
Everything we need will come together as it should.
"The only thing to do is jump over the moon... "
*staring deep into the face of the lion*
*taking a deep breath*
*jumping...*
[...So Mote It Be...]