Mars VS Venus

A beautiful animated music video 'Delta' by Wizz/CRCR & C2C

Gives me some kind of nostalgic feeling <3 

*Spoiler*

The ending seems very open, but I think there are women inside the triangle, due to the fact that there are
 only men on the planet and looking at the other symbols given in the video , (square/rectangle/circle).

Maybe the population is 'crossing the delta' by opening up to something new?