|Cracks in the lawn. Nikon D7000|
For those who follow the current incarnations of 'Dr Who' on TV, series five featured a crack in space and time that followed the Dr around through his adventures.
The crack in space and time seems to be present in our lawn too; well, the crack is big enough to get my finger in anyway! I think it is something to do with the sun really, but just in case,
(For those not familiar with Dr Who, look up the episode featuring the Weeping Angels; classic "behind the sofa" viewing).