Mini Mini Pocket no Ookina Niwa de  

In the Big Yard Inside the Teeny-Weeny Pocket, ミニミニポッケの大きな庭で

The phrase you provided is a riddle. It can be rewritten as follows: "When it shrinks, it expands; floats and sinks; separates but connects. When I think I'm watching them, they're actually watching me." This riddle describes an object that changes in size, position, and relationship to its observer. An animation may depict these days of observation, recording, and experimentation.