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Make an L with two sides. Grow a square on each.
Not a diamond. Not a maybe. A square corner — the kind in a room, in a book, in a tile.
A right corner is just an L. Off the short side, paint a square. Off the other side, paint another. Off the long side — the one that leans across — paint a third, the biggest. Pythagoras and his people stared at those three squares until they saw a sentence: the two small ones, added, are exactly the big one. Not almost. Exactly.
Drag a corner of the L. Watch the three floors grow.
In your life
The corner of a room. A book. A phone. Square corners are everywhere because they stack, they tile, they don’t lean over. This picture is hiding in your bedroom.