  We propose a way to discover, in tabletop experiments, spacetime-emergent
materials, that is, materials holographically dual to higher-dimensional
quantum gravity systems under the AdS/CFT correspondence. The emergence of the
holographic spacetime is verified by a mathematical imaging transform of the
response function on the material. We consider theories on a 1-dimensional
ring-shaped material, and compute the response to a scalar source locally put
at a point on the ring. When the theory on the material has a gravity dual, the
imaging in the low temperature phase exhibits a distinct difference from the
ordinary materials: the spacetime-emergent material can look into the
holographically emergent higher-dimensional curved spacetime and provides an
image as if a wave had propagated there. Therefore the image is an experimental
signature of the spacetime emergence. We also estimate temperature, ring size
and source frequency usable in experiments, with an example of a quantum
critical material, TlCuCl$_3$.
