The main currency or your bench mark is the USD.
That orders most of the pricing for many currencies and commodities on earth because of it's reserve currency status.
There Eur/usd,Gbp/Usd, Aud/Usd, Nzd/USD, are optimistic correlated currencies
the USD/JPY, USD/CAD, USD/CHF, are negative correlated currencies
the EUR/JPY is the only other pair not between the USD in it's pricing
all other pairs are artificial EUR/GBP is Eur/Usd vs Gbp/Usd etc
now the correlation is not equals one
individual economic policies,...