Using utensils, items that open and close by folding. (E.g., folding tables, strollers, playpens, folding chairs, etc.)
How to Work with the Light in the Refrigerator on Shabbos. Part 2;
Bottom Line and Summary: Combing and Brushing One's Hair on Shabbos;
Is One Allowed to Open a Window When There Are Plants in the Room?;