Comment on Old City Kuwait by Iscariath
Jeez that is freaking impressive... You must have to spray the sand with a fixative, there's just no way it maintains that kind of structural integrity. Incredible work. You also must have the patience of a saint.
The sand will stand by itself. We will spray a mixture of water and white glue to it to protect it from the rain, wind, sun, but it's not what it make the sand stand. This sculpture probably weight over 50 tons, so no amount of glue will make it stand if it decide to collapse. Sharp grains and natural clay content will help the sand compact in such a way that you can get such height.