Press the green flag. Type a number (best from 0 to 5). The project will generate a Koch snowflake with the number of iterations depending on the number you typed in. Type -1 to make the project show you more and more detailed Koch snowflakes. If you want, turn on Turbo mode (Shift + green flag).
More information about the Koch snowflake: https://en.wikipedia.org/wiki/Koch_snowflake