It’s a Lego building version of the game Telephone. You whisper a word or phrase to a person, that person repeats what they heard to the next, and it continues until the last person to see how the message started and what it mutated into by the end.
In this version, the idea was that the MOC received would serve as the inspiration build. Whatever it is, that is your source of inspiration or thing you are to base your own build off from; a building prompt in visual form. But like in Telephone, you can only see the build before your own, none that came after until the end.