idea fo the transform

For the idea, I make a transform from real world to that fantasy world. The story is a girl transformed to ancient Egyptians myth world through a cat sculpture.  When she looked the cat through the window and got closer and closer, the cat blink of its eyes, and she found that the world change to the myths world when she focused on the reflection on the window’s glass. And when she turned back, she saw all of her world became the myth world and there were full of gods and beasts, and she turned back to the cat and the cat use her feet to touch the girl, and the girl waked up to the real world , and the cat sculpture was disappeared.

And for how to make this animation, it’s hard for me to describe the different between the real world and fantasy world. And I need to focus on the transform’s animation, when the girl looked to the cat how the environment exchanged , and when the girl looked back how the real world connected with the fantasy world . Also the design of characters i need to connected tem with the myths and stories.