In a magical forest, a tree grows in such a way that it doubles in height every year and never stops growing. Anaya, who is 5 feet tall and has the magical ability to climb any height with ease, marks her eye level on the tree. The next year, Farid, who is the same height as Anaya, comes to the same tree. Even though the tree has doubled in height, Farid finds the mark left by Anaya exactly at his eye level. How is this possible?

Provide a brief response.
This phenomenon can be explained by introducing a magical property of the forest which specifies that not only does the tree grow, but the entire forest, including everything and everyone in it, also scales up proportionally. Therefore, when Anaya marks her eye level on the tree, she is 5 feet tall and the marking is at that height. After a year, when the tree has doubled in height, Farid, who is under the same magical influence of the forest, would also have doubled in height, maintaining the same proportion relative to the tree. The doubling in height of both the observer (Farid) and the tree means that the eye-level mark appears at the same position for Farid the following year, despite the tree's growth. Hence, Farid sees the mark at his eye level because both he and the tree have grown in such a way that their size ratio remains constant.