From left to right, the balloons are filled up with different things:
Small pebbles, sand, water and the last one, just air.
They all weigh and feel differently and when stamping into the paints, it’ll give a different impression. Listen to the sound as it hits the paper. How are they different from one another?
If you double up on the balloons before filling them up, it would make a great sensory “squeeze/stress” balls if you fill it up with sand, rice or even beans.
***Always supervise your children when using balloons as these are a choking hazard. If you’re just playing with simple blown up balloons and they pop. Make sure to pick up all the loose pieces and toss them in the garbage so animals and young children don’t ingest them.