Varible "water" thickness would make it possible to create new media ranging from thick paste-like paint, gel media of varying thickness at the hgh end, down to turpentine, alcohol, and acetone at the low end. Mixing the "water" of differnt viscosities with current oil/acrylic paint, watercolor, or ink would make it possible to create effects not currently available in any digital program.
I think someone has already requested alcohol inks, and many people have requested thicker impasto. Both requests could be satisfied by making water of varying viscosity available.
One account,
many possibilities