Several ways to visualize the EM spectrum:
a. Augmented Reality: virtual reproduction of the hertzian space by blending computer-generated data and real world footage in real time. Creation of a three-dimensional topography in which people are able to navigate consciously.
b. Material Deformation: tangible reproduction of the hertzian space by alteration of matter. Use of smart materials.
c. Signage: conversion of radiations into signals to display informations.
d. Materialization: making the EM radiations tangible and thus visible by using extremely rarefied reactants. Kind of what happens with aurora borealis.