Here's an example[1] at random from YT. Many knots can be tied multiple ways (that still result in the same knot), and many knots can be tied with slight variations (for example lots of things can be slipped by finishing the knot with a doubled-over bight instead of just the single line, allowing you to pull the 'tail' and quickly untie them).
1: https://youtu.be/lvIRHvu2va8?t=162