The Celsius scale we use today is slightly different from the original scale created by Anders Celsius in 1742. Here's the key difference:

* Original Scale: Celsius initially defined 0°C as the boiling point of water and 100°C as the freezing point of water. This was a reverse of the scale we use today.

* Modern Scale: The scale was later inverted so that 0°C represented the freezing point of water and 100°C represented the boiling point of water. This change was attributed to Carl Linnaeus and others.

In summary, the main difference between the original Celsius scale and the modern one is the way the freezing and boiling points of water are assigned.