Completing the triangle

My sister opens the door and looks at me. I put down my book for a moment, rub the green velvet of the armchair with the palm of my hand and look over to the rug. The cat looks at me. He preens himself, rather spontaneously. He never knows when the urge to lick will strike. Then he looks up, at my sister, who still stands at the door, and has been looking at him.

"Yes!" she yells, jumping up and down, her curls bouncing in the light from the window behind me. "Yes! Finally! We complete the look triangle!"

The cat curls up and goes to sleep. I start reading again. The curtains listen to the sounds of cars passing erratically on a Sunday afternoon.