If you want to go swimming in Wisconsin in the summer in your favorite watering hole, you might find something like this which looks like spilled green paint and smells like it, growing on the surface of the water.
Si uno quiere ir a nadar  a Wisconsin en el verano a nuestra laguna favorita, pueden encontrarnos con algo así, que parece pintura verde  derramada y huele a eso, y crece en la superficie del agua.