This picture is taken from the Problem Pictures Numbers resource of photographs with activities for mathematics teaching.
If you purchase this resource the photographs are available in higher resolution and there are additional pages containing hints and solutions.
What shape is this pedal bin?
Try to match the squares on the floor with their reflections in the bin.
How many squares can you see in two places: on the floor and reflected in the bin?
What happens to the straight lines on the floor when they are reflected in the bin?