It can be realized by mobile projector.
Mobile phone projector is a projection device handmade by netizens using mobile phones. The main materials are: full screen mobile phones, magnifying glasses, shoe boxes, transparent tape, etc.
You need to adjust the focus and pull the brace. It will achieve a particularly clear effect.
In the process of using the mobile phone projector, it is also necessary to keep a long distance between the mobile phone and the shoe box, the greater the distance; The larger the projection image is, the better it should be cast on the white wall.
Shading requirements, the projection effect depends on the indoor brightness. It is best to project in a particularly dark environment. Can reflect the effect.