Now, you have to understand, an orchid blooming is not something that happens fast -- being epiphytes, they have slow metabolisms. It just goes to show how distracted I've been that this one managed to put out a stalk with four buds without my noticing.
I'm also surprised that it's blooming at all: I've had this plant for years and this is only the second time it's bloomed. The first time was the summer I was able to put it out in full sun. (They're native to Florida, ranging up into the South Carolina coast,and tend to favor sunny locations on branches and tree trunks.) I haven't been able to provide those conditions in my new place (no yard), and I'd sort of resigned myself to just letting it grow until someday. . . . (And from one small plant that I purchased years ago, it is now three rather full plants.)
The picture is close to mine, but the lip is completely purple on mine; the color of the petals and sepals is not quite as strong, but would be stronger if it had more light.