Two people approach the top of the ramp, a mother and her toddler daughter with a topknot, yellow shorts, white t-shirt and sparkling white, velcro-strapped shoes.

‘Yes,’ says the mother. ‘Down.’

The girl surges onto the ramp with a cackle, hands in the air and giggling as she tears downhill like a runaway clockwork toy, all the way to the bottom where she turns and grins with delight.

Her mother joins her there and they set off at a sedate pace, walking on the flat. The girl falls over.