"not thinking laterally enough"

an example:

If you have goldfish at home it is quite likely you have more than one fish, if you have more than one fish it is likely you have several of them, if you have several it is likely you keep them in a pond, if you have a pond it is likely you have a large house, if you have a large house it is likely you have lots of bedrooms, if you have lots of bedrooms then it is likely you have lots of kids, if you have lots of kids you make love regularly, if you make love regularly you don't masturbate.

If on the other hand you have not got any goldfish, your scheme for Stonehenge has probably just been scuppered !

VBB :)