A mosaic carpet of autumn foliage tinted in shades of green, yellow, orange, and red is currently rolling southward through the archipelago of Japan. 紅葉 (kōyō, crimson/leaves), the Japanese word for "autumn leaves," only hints at the splendor of this multihued natural phenomenon.
Beeches, birches, persimmons, larches and ginkgos all produce beautiful colors, but the King of Kōyō "the tree to see," is the Japanese maple (momiji; like kōyō, it is written with the kanji compound 紅葉). The crimson, lacy-leafed momiji — whether sunlit or artificially illuminated at night — is so impressive that the Japanese refer to autumn leaf-viewing in general as momijigari (紅葉狩り, Japanese maple/hunting).
The second kanji in 紅葉, 葉 (ha, yō), has the core meaning "leaf." Mastering the shape of 葉 is a snap if you divide it into its three top-to-bottom components — 艹 (plant-life), 世 (generation) and 木 (tree) — and memorize the phrase, "Leaves are successive generations of plant life on a tree." (Thirty years was the norm for a generation in ancient China, which explains why you can see three "10s" (十) in 世).