Glamping?

I was surprised to see this tent pitched on the lawn of the penthouse apartment across the way from us this afternoon. 

It seemed a little incongruous to be abandoning your multi-million dollar digs for a small gray tent, but then it became clear -- I think the tent was put up for two cute little kids I saw later on, playing on the grass.  It looked exactly like they were playing at "Olympics Gymnastics", doing somersaults and skipping and hopping about.