Two children re laying on a rug with some wooden bricks laid out in a square between them.
Two children are playing catch at a park.
The two children can't be laying on a rug at home and playing catch at a park at the same time.
A rug isn't usually found at a park, and playing catch while laying down isn't possible.
The children are either laying on a rug or are playing catch at a park and cannot do both at the same time.