Pepper's ghost

Reasons for modifying the plan:

1. Hologram fans are not very mature about HDMI at the moment. In the past, there were voltage problems. If there is a problem, it will be in vain, so we may directly switch to the pepper ghost solution, and finally we can use cheap holograms for buzsaki. Non-interactive version, made separately.

*2. If Pepper Ghost fights with text, you may need to disassemble the device into two layers. **

update方案：

Plan A: 两个屏幕，背靠背，一个做peper ghost，另一个直接展示文字

结论：这个方式work应该没问题

下一步：做小模型用ipad背靠背test

PlanB: projector+ 屏幕， 屏幕展示text, projector做peper ghost——fabrication还是用原来的方案