Most of Escher's work is too complicated for small children, but this video gives a nice introduction to the concept tessellation.
A tessellation is the covering of a plane using one or more geometric shapes, called tiles, with no overlaps and no gaps.
In mathematics, tessellations can be generalized to higher dimensions and a variety of geometries.
Work in groups.
Start with a square, rectangle or triangle. Each participant in the group makes a proposal for a pattern.
The group decides together which of the proposed patterns you will proceed with. Discuss how the parts are moved.
Each participant in the group makes 3-5 decorated (use paint or crayons) bricks based on the chosen pattern.
Each group assemble all their bricks to a collective work.
Document the process for the workbook.
Working with a paper with printed squares makes it easier to align the pieces. In this case the cutouts are rotated.
This makes a tile that tesselate by rotation, like the tessellation below.