The previous aliens have departed from Earth. Another group has arrived from the vicinity of Alpha Centauri or Sirius (it's not important which) to probe the human psyche.
Help humanity to score a perfect 10 by determining the organisational principle involved in the following sequence of figures, and hence the missing figure.
But wait, that's not all ...
There are a number of clues embedded in the problem description. You will either find them, or you won't.