As kids, in the mid '60s, we played with my father following a ritual very similar to the Spanish one explained in the wiki article. He used to start:
--Ό,τι βλέπεις, βλέπω;
--Τι βλέπεις;
--Βλέπω ένα... αεροπλάνο!
And we had to show the airplane.
We called the game Ό,τι βλέπεις, βλέπω.
Edit: And I must agree, it's a rather unusual syntax instead of "Βλέπεις ό,τι βλέπω;" but that's how I remember it. :)