Glass

I've been thinking the world is made of glass. It came to me in a dream one night as I strolled outside pulling glass flowers from glass mulch with my magnetic hand. Surprise overtook me but a moment later I put each flower back in its place. Looking around me, people were able to collect entire tree trunks and grow too tired for the limbs.  They'd leave them behind in heap on the ground.  But they would walk away much larger because the glass pebbles become a part of them.

Gravity still exists such that only humans have equal magnetic force to pick up things in the environment.  Glass pebbles are held to the ground, to each other, and to human magnetic hands.  There is variation in the extent to which these three forces pull them.  Pebble to pebble is the strongest magnetic pull.  Next are humans followed by gravity.

The glass was always the same size despite the person, animal or object.  It varied in how many pieces of glass were required to compose the object.  So every object is composed of many teeny tiny glass pebbles that are pulled together to form shapes.  Since pebble to pebble connections are the strongest, it is possible for humans to sit on glass objects like chairs.