Shiyan Yin

1 Introduction Transparent wood, an emerging bio-based functional material [1], has rapidly evolved from fundamental exploration to application-oriented development since its development in the early 1990s. Initial research in 1992 produced wood composites with light-transmitting capabilities by removing light-absorbing components (primarily lignin) and impregnating the resulting scaffold with refractive index-matched polymers [2].

Conflicts of Interest The authors declare no conflicts of interest. Supporting Information Filename Description pc70157-sup-0001-VideoS1.mp4MPEG-4 video, 6.9 MB Video S1. The video is a silent one, mainly showing the sample fading in two cycles of removing sunlight and sunlight. At the beginning of the video, the subtitle in the top-left corner reads “dark place”, and the subtitle “variable speed: 2×” in the bottom-left corner persists throughout the entire video.