This fountain was an unexpected treat during my visit -- again courtesy of a fantastic suggestion by José.
I was fortunate to be in Barcelona during one of the two evenings (Fri & Sat) when this light show is produced.
There was no purposeful reason for f/10 and ISO 640 --- I just forgot to change the ISO setting from
an earlier exposure. I was shooting in manual mode and was ok with the general light curve
and never remembered to check the settings. Tripod, remote cable release.

Below, a slide show going through the display at a much faster clip: