Musical instrument. Something rattles when shaking. If you do it in rhythm then you can play a melody. Very convenient, no notes, keys and so on. Mash your hands in the rhythm of the melody, here's the music for you.
I wonder what else children we learn from music, when they give ponremushki. What is essentially the same maracas, only made of plastic and sold in children's stores.
vote and sign and let's all be happy