You always need a surface to reflect the laser light. This can be fog or haze for beam shows, or all kinds of screens for projections. Very common screen types are waterscreens, gauze screens, rear projection screens or fog screens.
All 3D-like projections with lasers also need kind of a surface to be reflected on! Real 3D is not possible without having a 3D surface.
BUT: You can of course generate 3D look-alike projections with our systems. If you need support in doing that, please contact us - we have specially skilled professionals for high end shows.
You cannot create 3D-like projections in the air, but if you have a kind of surface (e.g. in between of two buildings), it is no problem to do so.
Unfortunately laser light cannot be "terminated" somewhere without having an end-point (surface).