You know the ones? They look like an explosion at the pixel factory, unless you stand just so far away and refocus your eyes just right and for just long enough that a 3-D panorama leaps out, thrilling and amazing all. Except me. I can’t do it. I’ve tried starting with my nose almost touching the glass and slowly backing away. I’ve tried gently relaxing the muscles in my eyes . I’ve tried defocusing, unfocusing, disfocusing -- everything. My husband and kids go from one to the next, saying, “Hey, cool! This one’s a cow! This one’s a space ship! This one’s the ceiling of St. Peter’s Basilica, complete with Michelangelo, paintbrush in hand!” I’m still standing there crossed-eyed and headachy looking at an explosion at the pixel factory. I think it would have been better if I didn’t know. At face value, they’re visually interesting; a collage of images and colours, almost a pattern, but not quite. I could enjoy them that way. But I do know and I’m missing something. Something my family s...