I was told that this looked like a sprinkling of pixie dust on the salar .... I'm not going to argue.
The Salar de Uyuni has a variety of surface textures, ranging from the 'classic' hexagons, to this spiky area of raised crystals. Given that it's very flat - or, over the whole 10,582 square kilometres, convex strictly speaking - I hoped that the Sun would illuminate the tips of the crystals when it rose. It did, but I hadn't anticipated that the time from first light to 'completely blasted with glaring light' would be less than two seconds! As it is, this is a little more light that I'd aimed for; I blame that on slow reactions on my part in pressing the shutter release remote ;-)
Some thoughts on pre-visualising too much: