-- you sit on a chair
-- gravity pulls something down
-- water pushes a log up to float
-- air holds the skin of a balloon out, in a ball-shape
-- my dog bites a bone
-- air holds the tires of my car out, in donut shapes
-- a book presses on a table
-- my shoes press down on the floor
-- my feet press down on the bathroom scale
-- the bathroom scale presses up on my feet
-- gravity pulls the Earth up toward me