Was that a rhetorical question? Delana thought to herself... but answered anyway...

Other than the reasons already mentioned, I think it would be useful in art, or in preserving something. As anyone with experience rock-carving will tell you, it takes time to form a stone into something... so if you were able to instead form something into stone, it would save time and offer more possibilities for creative uses. Or, to aid in building of walls and other such things for protection of homes or cities..." Delana didn't know if this would make sense... but it did in her mind, so she waitied to see what the Professor would say.