Frosted tyres

My walk from home to school follows a huge 4 lane road for the most part and then cuts off across a sweet little park. The fringes of the park are reclaimed, I'm sure not entirely officially, as allotments, and the fringes of those are reclaimed as a general dumping ground. In between the neatly planted and well attended vegetable rows are heaps of tyres, tubes and misshapen concrete lumps which turn out to be good for standing on to get sunset photos.