What does the obelisks do in the witness?

Question

One of the large black structures found on the island is the Desert Obelisk. It's purpose is tied to the many hidden Environmental Puzzles, and if you solve any of the nearby puzzles you will see a corresponding symbol. On June 17th, 2017:

Hagrid P Hazard · Accepted Answer

One of the large black structures found on the island is the Desert Obelisk. It's purpose is tied to the many hidden Environmental Puzzles, and if you solve any of the nearby puzzles you will see a corresponding symbol. On June 17th, 2017:

What does the obelisks do in the witness?

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