I'm not sure what the term is for when the eye an image of something where there really isn't one. I had thought it was "asterism" but my dictionary says that's specific to stars/constellations.
Below is an example of what I'm talking about. For many years, the Arboretum would have big orchid shows in February, with many, many different types on display. One that caught my eye was the "gongora tricolor". This orchid has lots of small flowers growing from one main plant. However, when I saw it, I didn't think "flower"; I thought "dragon" (or, if I was to be really geeky about it, "wyvern"). How to show that vision best? The easiest, I thought, was to show it in silhouette, so the shape would be obvious. Can you see the head, wings and talons? This was and easy shot to take since there was a window behind the flowers and the bright background would force the foreground to darken [isn't understanding how cameras work fun!].
So, there's my dragon. If you want to see the actual flower, there is another photo below that was taken against a more neutral background and, I think, with a bit of flash.