Multicolored LED lights concentrically ring the high ceiling of the upper level of the stupa. The lights represent the state (or path to) enlightenment and Nirvana.
4 Buddhas with different mudras. The center one is Dhyana (meditation), the left one is Dharmachakra (teaching), and the one on the right is Abhaya (no fear). The mudra not pictured is the “forgiveness” mudra.