Digging.
Steps:
01. Find a shovel to use
02. Dig or clear ground in the desired geometry
NOTE: the depth of these holes is up to you - they could be the height of a building like at the Durrington Walls, or scrapes from the crust of the earth similar to the Nazca Lines
This manifestation method is used in the following examples and tracings:
Nazca Lines, Durrington Walls