In the background of this image, there are seven rocks sitting in a perfect line behind Tom on the window ledge. Even from a young age, he had a fascination with the number seven, which he will remember when deciding on how many times he should split his soul for ultimate power and everlasting life. But why rocks? He was an orphan and orphans aren;'t usually known for their wealth. Rocks may have been used simply because they're free and a decent weapon for a young boy. They were also most likely taken from the cave where he hides the locket horcrux.
