The purpose was to demonstrate the versatility of the objects it can contour to in order to give an idea of how you can use for you projects. However to answer your question a practical application for knowing the "contour" of a rock could be for a side walk project that involves stone or even a textured wall with different pebbles and stones.
How can I order one
The link is in the video description
i am da miznountie
Why would you want to know the contour of a rock?
The purpose was to demonstrate the versatility of the objects it can contour to in order to give an idea of how you can use for you projects. However to answer your question a practical application for knowing the "contour" of a rock could be for a side walk project that involves stone or even a textured wall with different pebbles and stones.