Standing on the stairs to our flat when we got back last night, Mariam watched me flick the light on, then reached out and gingerly fingered the smooth white plastic.
“Go on, press it” I said.
I flicked the switch again, and everything disappeared. Again, and we were surrounded by light.
Mariam looked at me even more nervously, and I realised that to her almost one-year-old mind, it must have seemed like we’d found the switch to the whole world.