The dolphins always remind me of the festina lente emblem, used as first logo in the world by Aldus (who printed the Hypnerotomachia that I guess most people here know). The anchor means steadiness, the dolphin mobility. Move, but don't rush. Stay, but don't stagnate.
The fact that it's two dolphins expresses for me that living interaction. A relationship, a bond, a union is never a static thing. It means changing together, moving together, but never rushing.
I think it's wonderful that the anchor is replaced by a living anchor, a flower anchored in the earth beneath the water.
It's a genius visual formula IMO.