As you are exploring the wilderness of Hyrule in Tears of the Kingdom, you will come across an unusual stone pillar with a Steward Construct nearby who will give you the following riddle.
“Dye the white pattern black when the sun awakens in the sky. Then will the sacred shrine appear”
To solve this riddle, you will need to modify the large pillar behind you and rotate it so that it is lined up with the stone shape on the nearby rock face. When the sun rises in the morning, it should cast a shadow on the rock pattern and if the shadow shape matches up with the stone pattern, a shrine will appear.
Position the stone pillar so that it looks like the image above. Ensure that you place the wooden plank into the slot on the left side to match the shape on the wall.
There is a fire nearby so you can use flint to light the fire if the time of day is incorrect. Wait until morning when the sun is rising. Look at the stone shape on the rock face and you will see the shadow slowly move across the rock face.