[achr2]

I think it's a spinning plane with a projector beneath. Their limitation is in the DLP projector's refresh rate. Seems they also may have extra limitations in colour space, since most DLP projectors use a rotating colour wheel.

[nom]

It have to agree with the parent, it definitely looks like a display or a projection surface oscillating in the vertical direction.

I'm really curious if they opted for a display or a projector. A display is heavy but it might be possible if they use a vacuum. A projection surface on the other hand can be very light but you have to calibrate the optics and it _has_ to have a display and not a DLP chip, etc.. it's a really interesting problem to solve.