This open access book tackles the design of 3D spatial interactions in an audio-centered and audio-first perspective, providing the fundamental notions related to the creation and evaluation of immersive sonic experiences. The key elements that enhance the sensation of place in a virtual environment (VE) are:Immersive audio: the computational aspects of the acoustical-space properties of Virutal Reality (VR) technologiesSonic interaction:the human-computer interplay through auditory feedback in VEVR systems:naturally support multimodal integration, impacting different application domainsSonic...