Size trope: In The Mirror
"See? This is you. This is **us**."
I bring him to the mirror. He clearly see our reflection, - well, mostly me. A regular, 5'4 woman in the gym outfit, standing next to a full height mirror at the gym.
Only with considerable effort he can see himself. A tiny figure standing in the palm of my hand. Hardly a human being; more like a doll or an action figurine.
He waves his tiny hand at the mirror. The tiny figurine waves back.
I smile at him, while he realizes for the first time: It's not I became a giantess. It's him being shrunk. He sees himself from my point of view - for the first time.
I let that thought to settle in his head, and then slowly, carefully, I bring my hand to the mirror.
The magic happens. My image grows, gets distorted and stretched, until it's no longer a woman but a part of the landscape.
He, on the other hand, grows, until he can finally see himself as a human, standing on the pink platform in front of the mirror.
And then i pull the hand back.
At some point, both realities occur simultaneously, like an ambiguous image: the brain is confronted with seeing both pictures simultaneously.