Alien: Early Ridleygram for astronaut climbing the side of the egg silo

leading from

Ridleygrams

a) Ridley drew a storyboard showing an astronaut climbing up the side of the egg silo

Ridleygram of explorer climbing up the side of the egg silo

b) We can see that he took the idea from  looking at the bridge from the design for Giger's Dune I (Entrance to Castle Harkonnen), 1976, making it smaller.

Giger's Dune I (Entrance to Castle Harkonnen), 1976