What does 'I open at the close' mean in Harry Potter?

In the context of Harry Potter, the phrase "I open at the close" refers to the Golden Snitch that Harry receives from Dumbledore's will. The Snitch opens to reveal the Resurrection Stone, one of the Deathly Hallows. This phrase symbolizes the idea that in death, there is the possibility of new beginnings and revelations. It also signifies the cyclical nature of life and death in the wizarding world.