Using utensils, items that open and close by folding. (E.g., folding tables, strollers, playpens, folding chairs, etc.)
What Should One Do If They Pressed a Button of the Bell, Watch, etc. by Mistake? Electric Water Meters on Shabbos. Winding Swings on...
making boxes (e.g., cardboard birthday cake box, cookie box, etc.). Putting a mattress on a bed. Using liquid soap that becomes foam;