Oh yeah, sunburn.  It looks like you need to clean the crown with some hydrogen peroxide also.
Since this is the second case of sunburn in just a few days, I would also like to caution everyone as spring approaches to let your plants acclimate slowly when putting them outside. Also even if there is no direct light on them, if the leaves are wet, dry them as the light definitely magnifies and will burn them.
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"If nature ever showed her playfulness in the formation of plants, this is visible in the most striking way among the orchids. They take on the form of little birds, of lizards, of insects, a man, a woman, sometimes like a clown who excites our laughter. They represent the image of a lazy tortoise, a melancholy toad, an agile, ever-chattering monkey. Nature has formed orchid flowers in such a way that, unless they make us laugh, they surely excite our greatest admiration." Jacob Breynius
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