Using a slow shutter speed for waterfalls is a popular technique and this is the ultimate version of that. You guys call 1/4s slow but, come on, it isn't — it's less than the average blink of an eye (about 1/3s).
At Cleopatra Terrace, run-off from a hot spring flows down a little hill, depositing minerals as it cools. At the moment, the flow is just a trickle but you can see a whiff of steam at the top. I figure the effective exposure here has to be at least several decades.
I've posted both in black and white and in colour and I'd be interested to hear your opinions on which works best, or on anything else, for that matter!