The description of the wind wall spell says:
A wall of strong wind rises from the ground at a point you choose within range. You can make the wall up to 50 feet long, 15 feet high, and 1 foot thick. You can shape the wall in any way you choose so long as it makes one continuous path along the ground. The wall lasts for the duration.
It doesn't say cast on a point that I can see like some spells say. Does that mean I don't have to see the area that I'm casting it on?