Holograph

But when a holograph is placed backwards in its holder and illuminated with laser light, it can produce a real image […]

Producing a holograph involves illumination of an object through the use of intersecting laser beams.

Of course, it is impossible to show what a holograph is really like in a two dimensional picture such as this.

The will was holograph, for Mr. Utterson, though he took charge of it now that it was made, had refused to lend the least assistance in the making of it;