Degrees

When does a breeze become a blow a single flake a storm of snow
A psychopath lovingly petting a dog, an honest banker altering his log
What's too hot or too cold, when is one too young or too old
Boundary between sad and glad, good or bad, happy or mad 
How fine a line before it disappears, when does a passing glance become leers 
A straight line at close vicinity will form a circle growing to infinity