How did the constable unconsciously nbsp suggest that Harv and Nell could learn nbsp some valuable t......

Read the passage given below and answer the questions that follow :
"It's a brisk morning," the Constable said. "Why don't you join me inside the gatehouse, where it's nice and cozy, and I'll get you some tea." On either side of the main gate, the fence terminated in a small stone tower with narrow diamond-paned windows set deeply into its walls. The Constable entered one of these from his side of the fence and then opened a heavy wooden door with huge wrought iron hinges, letting Nell and Harv in from their side. The tiny octagonal room was cluttered with fine furniture made of dark wood, a shelf of old books, and a small cast-iron stove with a red enamel kettle on top, apid pocked like an asteroid from ancient impacts, piping thout a tenuous column of steam. The Constable werdirected them into a pair of wooden chairs. Trying to scoot them back from the table, they discovered that each was ten times the weight of any other chair
they'd seen, being made of actual wood, and thick  pieces of it too. They were not especially comfortable, but Nell liked sitting in hers nevertheless, as something about its size and weight gave her a feeling of security. The windows on the Dovetail side of the gatehouse were larger, and she could see the two corgi dogs outside, peering in through the lead latticework, flabbergasted that they had, through elde some enormous lacuna in procedure, been left on the outside, wagging their tails somewhat uncertainly, as if, in a world that allowed such mistakes, nothing could be counted on. The Constable found a wooden tray and carried it about the room, cautiously assembling a collection of cups, saucers, spoons, tongs, and other tea-related armaments. When all the necessary tools were properly laid out, he manufactured the beverage, hewing closely to the ancient procedure, and set it before them.
Resting on a counter by the window was an outlandishly shaped black object that Nell recognized as a telephone, only because she had seen them on the old passives that her mother liked to watch-where they seemed to take on a talismanic sd significance out of proportion to what they actually did. The Constable picked up a piece of paper on which many names and strings and digits had been hand-written. He turned his back to the nearest window, then leaned backward over the counter so as to bring most of him closer to its illumination. He tilted the paper into the light and then adjusted the elevation of his own chin through a rather sweeping arc, converging on a position that placed the lenses
of his reading spectacles between pupil and page. Having maneuvered all of these elements into the optimal geometry, he let out a little sigh, as though cuss the arrangement suited him, and peered up over his glasses at Nell and Harv for a moment, as if to to suggest that they could learn some valuable tricks by keeping a sharp eye on him. Nell watched him, fascinated not least because she rarely saw people in spectacles. 
 

How did the constable unconsciously suggest that Harv and Nell could learn some valuable tricks from him ?
 

by gazing up over his glasses at Nell and Harv for a moment

By: Parvesh Mehta