One reason our illusions are so effective is that they look authentic to e. She doesn't just feel the ropes, she sees them around her legs. She doesn't just taste the strawberry, she sees it in her hand. When all your senses are pulling in the same direction, your mind tends to believe. In most cases, e reports that scenes score 9 out of 10 for believability.
It wasn't always this way. I remember that the first time I gave her labial rings, she reported they were slightly transparent at first, and then greatly faded the next day. I just told her to make them stronger again, several days in a row. That seemed to work. I also remember telling her once that when she looked in the mirror she'd see my face instead of hers. What she saw instead was my face blended with hers. Apparently it's difficult to apply your makeup that way.
Why are these illusions now so clear to her? I'm not sure. But she does have a vivid imagination. And she has a very strong memory for images. I was showing her a few photos from the web, and she was able to tell me immediately which ones she'd seen before. She has a strong memory for places; she gave me a narrated walk around her college suite one time, clearly intrigued by some of the visual memories she was recovering in the process.
Another reason her visual illusions are clear and convincing is that ... I told her so. When I'm not sure how well an effect is going to "take," I sometimes boost my odds by simply telling her that she will find it completely persuasive and real. Hey, whatever works.
The only problem comes with images of things that she's never seen before. We have this running joke about Scotland, because I once told her to go there for a few minutes. Problem is, she's never been; she had nothing to draw upon except some magazine advertisement photos in her head. She said Scotland looked very clean, tidy, immaculately composed, with perfect sheep on the hillside. ... That scene returned last week when she flew over it as a dragon. Same damn sheep.