Omar Shareef
To me, nature is a stark example of the beauty and the complexity of God’s creation. A tree, which starts as a simple seed, can grow to be of massive size. However, in order to grow, a tree must be rooted into the ground. It is these roots which anchor the tree in the soil, keeping it straight and stable, and absorbing nutrients from the surroundings that allow it to grow. In a similar vein, it is Allah, The Creator who is the anchor which provides the platform for all things to be created and facilitates growth. Without Allah, as without the roots, there is no way for things to grow or for creation to subsist.
As such, the picture above depicts a tree, and the roots of the tree are meant to spell out Allah in Arabic. This is meant to demonstrate how God (Allah) is the root of life for all things. The Qur’an repeatedly emphasizes Allah's role as the Creator (Al-Khaaliq), describing how He brought everything into being and sustains it through His divine power, and the calligram above is meant to represent that. The tree above is supposed to represent all of creation, and Allah is the foundation for its occurrence.