What is it!

Is it a dolphin? Is it a whale? or is it a soapy bubbly type sac full of air - Yes, it's the last one.
Went to the Forest Vintage machine show this morning and this bloke and his wife were demonstrating this amazing bubble maker. They are really strong and floated around for ages before finally either disappearing into the sky or landing on the ground, or maybe hitting someone so they burst cover them in tiny droplets of soapy material.
Bearing in mind we were in the Forest of Dean that might not altogether be a bad thing! Ooops, too controversial maybe?