When you lay stones on pathways and patios in the garden you should remember to choose stones that are approximately the same size so that the surface you are laying is not too uneven to walk on.
Also perform the preparatory work carefully. If it is wet where the stones are to be laid you should dig deeper and place a drainage layer of macadam in the bottom under the base course. Otherwise the stones can move both vertically and horizontally in the winter when the ground frost comes. The chances of the stones returning to their original position when spring comes is very small.
The size of our material is usually specified in millimeters. This means for example that macadam 11/16 is a crushed rock material where most particles are
between 11 and 16 mm