Wide Inner Dual Split Area
194.8 cm²
Optimal 4:3 column readability
Tall Inner Dual Split Area
171.2 cm²
Compressed narrower aspect columns
Wide Outer Reachability
78.4%
Corner grip stretch required
Tall Outer Reachability
91.2%
Easy single-handed thumb span
Ergonomic Trade-Off Analysis
The Wide Book Fold excels in internal productivity: its passport-like aspect ratio delivers standard 16:9 widescreen video with only 21.4% letterboxing waste and full side-by-side web browsing. However, its 77.1mm folded width limits single-handed outer thumb reach to 78.4%.
The Tall-Narrow Fold prioritizes single-handed one-hand pocket comfort with 91.2% outer reach, but forces an ultra-tall 22.1:9 outer screen and experiences 32.6% pillarboxing black-bar waste on standard 16:9 media.