Adds Book, a fifth desktop effect. The left half swings around a vertical spine and folds over the right, with perspective, crease shading, and a contact shadow. Select it in Appearance and try the angle slider or preview playback.
The existing Silk, Shade, Frost, and Arc styles remain available. All eleven tests pass, including Metal checks for the fold crossing and exact restoration.
Download OpenBendy-macOS-universal.zip, extract it, and replace your installed app. This universal build is Developer ID signed and notarized by Apple, with its notarization ticket attached. It requires macOS 14 or later. Enable Screen Recording in System Settings if macOS requests it.