The perception of depth in Science Park Gadgets is achieved through a variety of visual and auditory cues. Visual cues include 3D models and textures, shadows, perspective, and the use of perspective in objects like trees and buildings. Auditory cues include sound effects, background music, and soundscapes. These cues work together to create a sense of depth and realism in the game. Additionally, the use of virtual reality technology can further increase the perception of depth.