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People's ability to remember and recall spatial information can be harnessed to improve navigation and search performances in interactive systems. In this paper, we investigate how display size and input modality influence spatial memory, especially in relation to efficiency and user satisfaction. Based on an experiment with 28 participants, we analyze the effect of three input modalities (trackpad, direct touch, and gesturebased motion controller) and two display sizes (10.6 and 55 ) on people's ability to navigate to spatially spread items and recall their positions. Our findings show that the impact of input modality and display size on spatial memory is not straightforward, but characterized by trade-offs between spatial memory, efficiency, and user satisfaction.

Augmented reality (AR) can create the illusion of being virtually co-located during remote collaboration, e.g., by visualizing remote co-workers as avatars. However, spatial awareness of each other's activities is limited as physical spaces, including the position of physical devices, are often incongruent. Therefore, alignment methods are needed to support activities on physical devices. In this paper, we present the concept of Re-locations, a method for enabling remote collaboration with augmented reality in incongruent spaces. The idea of the concept is to enrich remote collaboration activities on multiple physical devices with attributes of co-located collaboration such as spatial awareness and spatial referencing by locally relocating remote user representations to user-defined workspaces. We evaluated the Re-locations concept in an explorative user study with dyads using an authentic, collaborative task. Our findings indicate that Re-locations introduce attributes of co-located collaboration like spatial awareness and social presence. Based on our findings, we provide implications for future research and design of remote collaboration systems using AR.

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Outreach and citizen science are important aspects in research and development. For example, the collection of bird-related data is driven forward by non-professional ornithologists as well as by researchers. At the exhibition "From Lake Constance to Africa, a long distance travel with ICARUS" which took place during the summer 2018 at the island Mainau in Germany, a Virtual Reality (VR) installation was shown utilizing movement data of a flock of storks. Two VR binoculars were installed which were used by the visitors to observe storks flying, following their way from Lake Constance towards Africa based on GPS data of real storks. In this way, viewers experienced a 360 • view on top of the stork "Bubbel" as it flies with 26 flock mates. The VR binoculars were created as a 3D print equipped with a smartphone, VR headset and other special features enabling the long-term use. The overall project consists of three components: 1) the production software Bird Watcher, 2) the exhibitioncompatible exploration software Bird 360 • , as well as 3) the hardware setup: the Sword of Stork Bubbel.