The same Buddhist theme from the exterior also makes its way to the interior with many different factors. The first is that the walls and columns all slant inward to the center of the building. This is to help with the structural integrity of the building, but to also make the feeling of the room ascending. The interior is also greatly decorated with murals all over the walls. The murals are typically the story of Buddha's life and travels but also include Hindu aspects as well. The inside is of the building is typically quite dark because the main lighting comes from the narrow vertical windows and the fact that the murals and all of the indoor decoration are darker materials. The narrowness of the windows is for structural concerns, but to also help with the ascension feel because they are actually trapezoids that are wider at the base. The interiors at Wat Phra That Doi Suthep contains myriads of Buddha statues that come in all different styles and materials just like the outside courtyard.