Fun with arithmancy and divination

[Catlady (Rita Prince Winston)]

--- In HPFGU-OTChatter at yahoogroups.com, "justcarol67"
<justcarol67 at ...> wrote:
>
> coscinomancy (divination using a sieve and a pair of shears). 

How do they divine with a sieve and a pair of shears? I don't suppose
they throw them into water and if the sieve floats, that means 'No'
and if the shears float, that means 'Yes'.