Each time I've spotted a pair of shoes dangling from a high, high cable, the laces fused together in an impossible knot, I've wondered how and why they are up there. Some people tell me that it started as a marker for dealers. Other reasons I've heard for the cases of floating footwear include, art, blithe mischief and even bullying. All are plausible. Yet for some reason I just can't help but bring the hidden town of Spectre to mine each time.