Colour symmetry. Pavements: Brasil, S. Paulo - p2 - «p2»

p2

Small yellow circles mean rotations of order 2. Yellow lines are the border of a fundamental region.

Small yellow circles mean rotations of order 2. Yellow lines are the border of a fundamental region. (12) means that the colours white and grey are interchanged; i means the identity.

This is an example of the case stated in the third row of the table in Section 4.1 (Figure 11, «p2») in

Periodical plane puzzles with numbers

See:
Wallpaper groups. Pavements: Brasil, S. Paulo - p2
Wallpaper groups. Pavements: p2