The mystery of RADIO is what raised my interest in technology, especially electronics and physics. I made my first radio - a crystal receiver - before I was 12 years old, I think. The poster shows the simplest and most magical radio receivers of all: the "Brownie" no. 3 crystal receiver. This device uses no battery or plug: what you hear in your headphones is purely the energy of the radio waves!

This is the first in a series of three vintage posters, which I made in 2021.

Sources: Most of the image elements and information used in the posters are from Wikipedia/Wikimedia Commons.