Magic Tricks

Why did JM Craft (and every dealer who sells this , including Penguin) think it was ok in the demo video to EXPOSE the working of this effect ? The exposed views shown in the video really devalue it. All these images are now stored in Google's Image Search Cache. The thing is, the people who know what this is (i.e. a Tommy Wonder style vanishing bird cage) already know how it works, they don't need to see the exposed view to know what they are purchasing, and the people who don't know what it is don't need that information exposed to them. If JM Craft had confidence in their product they could just hire a competent performer to demo the effect . I don't understand this need to "show off" the mechanics of the cage.