This is a 3 category Venn Diagram shown here in a 4 x 4 grid.
There are blue rectangles, yellow rectangles and where they overlap green rectangles.
There is a pile of 16 pictures. 6 ***** [blue rectangles], 6 ***** [yellow rectangles] and 4 that **** [green rectangles].
Drag 15 of the 16 pictures from the pile and drop them into the grid.
Do not bother about sorting at this stage as you can rearrange the position of the pictures at any time.
*Take care however, !!! when you drag in your last picture the grid becomes FROZEN.
To restart the activity just refresh the page.