Some people have asked me how i got the idea to make a comedy about a rock saving the world, but they haven`t asked me yet about the specific character design of Rocky. The closest i got from that question was when my nephews noticed the "face" of Rocky. One of my brothers got surprised about the hidden face because he only saw them as wrinkles of the surface of the rock.
I designed it to be a "two layered optical effect", so people could notice a face and/or wrinkles of a rock. At first i was going to make it look like just a generic rock, but after experimenting a bit with the surface or Rocky, i got the idea of shaping it like a face.
@Harmony-S-S The visual effect where some people see a penguin with a scarf was a complete accident. You are not the first one who sees a penguin, which makes this extra fun because it feels like Rocky is doing mind tricks.