[ Appologies if you receive multiple copies of this announcement. ] A record high number of paper submissions received. We are expecting an exciting high-quality technical program. Now we are *calling for posters and demos*: https://sui.acm.org/2023/posters *IMPORTANT PAPER DATES* Submission deadline: *Aug 20, 2023* Author notification: August 27, 2023 Camera Ready: Sept 3, 2023 *SUI 2023 latest news:* Professor Tim Dwyer and Professor Kiyoshi Kiyokawa have accepted to give keynotes at SUI 2023: https://sui.acm.org/2023/keynote Two journal special issue approved: Journal on Multimodal User Interfaces (SCI indexed, impact factor:1.694): https://www.springer.com/journal/12193 Computers & Graphics (SCI indexed, impact factor:1.821): https://www.sciencedirect.com/journal/computers-and-graphics *TOPICS* All topics that are directly or indirectly relevant to spatial user interactions and interfaces are welcome. Topics of interest include, but are not limited to: Design practices, principles and frameworks Interaction design, usability and user experience (UX) User interface metaphors Evaluation methodologies and metrics Perception and cognition Human factors and ergonomics Ethical, social, cultural and language factors Inclusion and accessibility Privacy and security Empathy, trust, acceptance and safety Interactive spatial computer graphics Spatial input devices and technology Haptics, spatial audio, touch, tangible, gesture based spatial interactions and interfaces Multimodal/multisensory and other novel forms of spatial interaction and perception Spatial interaction with data, virtual humans and avatars Distributed, multi-user and collaborative spatial interaction Immersive analytics and visualisation Intelligent spatial interfaces, interaction and collaboration User adaptive spatial interaction and personalization Applications of human spatial perception to interaction Applications of spatial UIs, such as games, entertainment, CAD, education, health, engineering