In my hobby of "amateur radio", I like to communicate by telegraphic communication using the most basic modulation, the dah-di Morse code, which communicates by interrupting the transmitted carrier wave. This is similar to communication by wolfsbane (wolf smoke). When you are communicating by voice into a microphone and suddenly the propagation of the radio wave becomes poor and it becomes difficult to hear the other party's voice, you can switch your voice to Morse code and continue communicating with the other party as if a light had just gone on in the dark night.
When I visited West Germany in 1976, Sigi (DK9FN), Bernhard (DF5FJ), and Holger (DF2FQ) took me to the Seligenstadt Amateur Radio Club (DOK F38, DK0RA). This was my first visiting the foreign amateur radio club. When I arrived at the DK0RA club house, Hans (DJ3QT) talked to me "Welcome to our club." by the Morse code stricken with the key connected to the audio monitor there.
Usually, when I communicate in Morse code, I use my home made Electronics Key by combining logic ICs to produce accurately 1:3 ratio of short to long dots, but sometimes I use a "Straight Key," which is used by a person called a "grasshopper with rice" to hit short and long dots. It is a Morse code with only "dah" and "di", but strangely enough, it still conveys emotion.
The left straight key was presented me by Dr. Karl-Heinz Ilg (DK2WV), who is one of my best friends, and is a famous DX Peditioner in the world. Vielen Dank, lieber Karl !
There are some community groups (clubs) for the person who loves Morse code communication. I am a member of "JARL A1 Club" (#1682), "Straight Key Century Club" (SKCC #3086), and "Quarter Century Wireless Association" (QCWA #28339) that consists of members who hold a current amateur radio license and held an amateur radio license 25 years ago or more.