How to attach balloons to glass doors and windows?

Stick the double-sided tape on the glass, then blow up the balloon and stick it on the double-sided tape of the glass.

If there is wind outside the window, you can blow up the balloon and stick the binding rope [slightly thick] on the glass with adhesive tape.

Note that there are many kinds of double-sided adhesive, one of which has high viscosity and long decomposition time.

The principle knowledge of electrostatic adsorption is used in dry places or in winter. People will be sucked away when they walk by, but it's also fun.