Design a growing pattern which is either a numerical or non numerical?

Numerical growing pattern:

Start with the number 1. Each subsequent number in the pattern is the sum of the previous two numbers.

1, 1, 2, 3, 5, 8, 13, 21, 34, 55, ...

Non-numerical growing pattern:

Start with a small circle. Each subsequent shape in the pattern is a larger circle with a different color than the previous one.

Circle 1 (blue), Circle 2 (red), Circle 3 (green), Circle 4 (yellow), Circle 5 (purple), ...

Numerical Pattern:

Pattern: Incrementing by 3

6, 9, 12, 15, 18, 21, ...

Explanation: Each number in the sequence is 3 more than the previous number.

Non-Numerical Pattern:

Pattern: Repeating the sequence "AB"

AB, AB, AB, AB, AB, ...

Explanation: The pattern simply repeats the two-letter sequence "AB" indefinitely.