Colorful coral

This image was scanned from my sketch book / diary that I kept during my travel to Australia. This is a water colour sketch of a piece of coral that a friend borrowed to me for just that purpose.
Pieces like this can occasionally be found on beaches, so it doesn't really harm the reefs to pick up things like this. But it's still not quite legal to have, or at least to take across the border, I heard. I guess there's no way to tell the difference between a found piece and a piece that was broken of.
Luckily there are no laws saying I can't make a picture of it.