The island and it's surroundings went through a lot of alterations too. Scribbles and thumbnails led to extensive planning for connecting the key scenes. You see the final decision.
[Film screencaps]
A plane with a bumb makes an island, technically.
Moving pillars above my heads.
The moving pillars: An impressive description for something that needs prescription.
They're trying to narrow down you in wide fields...
...circling the desire.
[after the events in between] Backtracking into subsequent events lead though figments.