Love-in-a-mist

This plant is growing at the Reader Rock Garden, but we don't know what it is. Does anyone know its name? Some of the flowers were blue. Any help would be greatly appreciated! Note added a matter of minutes later: thank you, ngawangchodron, for sending the ID to dougwaylett! Oh, just as I was typing this, comments from Nuytsia@Tas and Old Stone have arrived. Wow, thank you all for the ID - and for sending it SO quickly! Very much appreciated!