Visual arts are a powerful means of expressing human emotions and thoughts.

He sent a message using Morse code.

This data is encoded, so special software is needed to decode it.

He created a program to encode the message.

He is writing a paper on coding theory.

He has a very passive personality.

His advice was very practical.

His target-like way of thinking is hard to understand.

He is my biggest enemy.

What is that target?