Another very mysterious, very short dream.

I saw a man's hand placing completely white blank cards in 4 vertical rows: in first it was 1 card, in second 2 cards, in 3rd - 3 cards, in 4th - 4 cards, like this, where each card led to the two next ones (sorry for the dots, but it's the only way to make some spaces - read from the left to the right, ignore the dots):
.......................... =
.............. = ->
...... = -> ........... =
= -> ...... = ->
...... = -> ........... =
.............. = ->
.......................... =

I heard myself asking: "So what are these cards about?"

The man replied: "Choices"

Just after hearing this, I suddenly woke up.