Block paving is bricks as roads and something that i think is plain weird. This brings me to these humans (my blog) near the zoo who entertain the zoo and us apes with the going ons of a bizarre nature.
First of these is that not all humans are experts in doing block paving, In icy conditions you get a skating surface so do expect insurance claims.
Then there is the weird behaviour of putting sand down on these bricks which will be washed off either by the weather or a person with a hosepipe. Sometimes there even painted with anti slip coatings. These brick things are an self perpetuating industry quite why anybody thinks there a good idea is a question needing an answer as seen in the wilds of camdem.