That's because Apple has eschewed the usual black plywood walls that go up around an under-construction Apple Store in favour of ones that echo the work of Catalan architect Antoni Gaudi. Even the Apple logo has been given a Trencadis mosaic-like makeover, according to MacRumors.
We really like the way that Apple has cleverly used iOS iconography in the storefront mosaics - something Spanish website iPordelante takes pains to point out in a series of images of striking images.