Kingy said:

A couple of days ago I went to the bunbury volcano to buy some solidified basalt for a client.

Just as I was approaching the front gate, there were some signs on the side of the road.

Not sure what I’m supposed to do here.

Well, the yellow and black sign says ‘trucks are ok here’.

The red and white sign says ‘trucks are not ok here’.

The space in between, marked by the puddle is a zone of uncertainty. Normal parameters of space and time may, or may not apply. Trucks can be, à la Schrodinger. both ok, and not ok. It cannot be said for certain that trucks will actually be trucks. Your truck may be a truck. It may be a case of Bollinger champagne. It may be a copy of the New York Times for Tuesday, 11 May 1926. Or something else. Who can say?