For puzzle hints and solutions, see Symmetry Island (Walkthrough).
Symmetry Island is an area in The Witness. This area introduces puzzles with two simultaneously drawn lines.
Glass Factory
Completing the glass factory grants access to the island.
Island
Upon completing the glass factory, the puzzle locking the first gate will become solvable, granting access to the island. Completing the puzzles scattered around the island will allow the second gate to be opened, and completing a final set of puzzles will activate the area's laser.
Obelisk Puzzles
Symmetry Island contains 3 obelisk puzzles.