## 4 Experimental Environment and Results
### Pillow Fight System: Design Results
#### 4.2.2 Design Implementation Results  
**Interface Design Implementation**  
This system achieves systematic innovation and optimization in interface design. As shown in Figure 4, the User Interface (UI) design framework includes four main aspects: game types, character elements, style design, and component layout. Based on the elderly interface design principles proposed by [PERSON] et al. [27], a comprehensive interface design framework was established in this study. In terms of game type design, this study developed two main modes: competitive and collaborative (as shown in Figure 5). This dual-mode design reflects [PERSON] et al. 's [15] findings on intergenerational interaction, effectively promoting social interaction and emotional connection during gameplay. Figure 4: User interface design framework. Figure 3: Pillow right interactive architecture: physical–digital integration for intergenerational interaction. Regarding character element design, as shown in Figure 6, this study particularly emphasized intergenerational user identification, integrating characteristic elements from different generations while adopting daily life elements as game icons to enhance users' recognition and game integration. The User eXperience (UX) design was built on a more comprehensive framework foundation. As shown in Figure 7, UX design covered five key aspects, each systematically planned and verified. Particularly in terms of physical-digital mapping, as shown in Figure 8, this study established clear corresponding relationships, enhancing users' operational confidence. Figure 5: Competitive and collaborative game interfaces. Figure 6: Character design elements for intergenerational appeal. Figure 7: User experience design framework. System Optimization Results  
Through systematic design iteration, this study achieved important optimization results, covering three aspects:  
1. Pillow sensing system optimization: * Improved image marking system to enhance operation position recognition; * Develop specialized pockets to resolve capacitive displacement issues; * Optimized sensing layer weaving method to improve accuracy and response stability. 2. Game software optimization: * Adjusted game speed to match elderly reaction time; * Expanded game content to increase entertainment value; * Improved operation process to enhance user experience. 3. System integration optimization: * Expanded tablet device compatibility; * Standardized equipment configuration process; * Enhanced system operation stability. Particularly in terms of the interaction parameters, this system achieved two significant breakthroughs:  
* It expanded the error tolerance range from one-quarter to two-thirds of the screen area, significantly improving the operation success rate (Figure 9);
* It reduced the object movement time from 0.47 to 0.17 s, better matching the elderly's reaction characteristics. 1. Interaction mode innovation: * Intergenerational co-play design: creating interaction methods suitable for grandparent-grandchild participation; * Intuitive operation interface: using natural patting actions as control methods; * Daily object innovative application: endowing everyday pillows with new interactive functions. 2. Technical application innovation: * Soft sensing technology: successfully applying capacitive sensing technology to soft materials; * Seamless integration design: achieving sensing interfaces without rigid-foreign-body sensations; * Technical breakthrough: innovative combination of fabric materials and conductive fibers, maintaining sensing stability under various pillow deformation states. 3. Design integration innovation: * Integration of psychological needs and functional requirements; * Seamless fusion of technology and daily objects; * Combination of intergenerational interaction and entertainment functions.