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"Real" images (physics / optics term) can be created by
the juxtaposition of inverse parabolic mirrors. [link]
There are various ideas on the HB related to this, but I
don't seem to find one related to security of public
The idea is to create a large version in which public
could appear before their audience as "real" while being
protected in a harm-proof chamber below.
Additionally, the acoustics are such that microphones
could be placed or aimed at the "real" images and
achieve the same soundfield as if placed near the real
Optical Display device
Juxtaposition of inverse parabolic mirrors [csea, Jun 24 2011]
Rapid Excavation by Rock Melting
Slower than nuclear explosion, but a good deal safer [csea, Jun 24 2011]
||[+] but how do you know they don't do that already ?
||//You'd think people would notice a 100 metre ufo
like object stuck into the whitehouse lawn. //
||Wasn't thinking of presidential figures. Perhaps more
suitable for a performance venue for rock stars, etc.
||Many large audience spaces are already bowl-shaped,
with the audience suitably located to realize the real
image. Just a simple matter of some earth moving.
||"The optimal location for this venue would be in a district *sorely* in need of re-development. We can also bid the excavation phase to be completed in a highly expedited time-frame, with the lower glass layer to be created - er, installed - simultaneously."
||Now we're interested, tell us more...
||// lower glass layer to be created ...
||Yes, but will the radiation produced make it
habitable? Perhaps subterrene technology would
be better [link]. This also creates a glassy surface,
suitable for silvering.
||One other aspect to consider is safety re.
projectiles - as light rays are reflected, so might
projectiles. It would be best for the reflective
surface(s) to be bounded by an energy-absorbing
||This is all well and good, until someone figures out
that by shining a torch at the right angle, they can
completely incinerate the public figure standing at
the focal point.
||Good point. But it seems that the most effective
angle would be from directly overhead, which could
easily be deflected (?)
||Perhaps when not in use, the top can be removed
and inverted, creating two large solar ovens.