The width of the mortar between the plates is regulated by the Object Radius control. One step of the Size parameter increases the mortar width by 1/1000 of the texture's smaller side. This was done because a mortar width that is greater than 10% of the texture's width is useless and we can use widths that are smaller than 1% this way.

By changing the Random Seed value you can change the plates pattern. This static generator function cannot be animated with the Time Offset argument.