In the 1963 mad cap, treasure hunt adventure movie "It's a Mad, Mad World" a dying thief reveals his treasure is 'buried under a big W, I tell you a big W.' At the end of the movie, as all the treasure hunters are standing, exhausted under a grouping of palm trees, one notices the palm trees form a BIG W above them.

I have always loved this scene and the expressions "can't see the forest for the trees" and "hidden in plain sight." So, with the letter W waterfalls, wisteria, waterlilies, and more distract from the obvious letter W.

Alphabet Menagerie - Letter W