ground

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ground

 [grownd]
1. a path of conduction from an electrical circuit to the earth.
2. to connect an electrical circuit or electrical equipment to the earth.
3. zero electrical potential.

ground

1. Basic substance or foundation.
2. Reduced to a powder; pulverized.
3. In electronics, the negative or earth pole that has zero electrical potential.

figure

A part or pattern in the visual field which has the perceptual attribute of completeness and is perceived as distinct from the rest of the field which forms the ground. Example: a printed word against a background page.
ambiguous figure An image or drawing arranged in such a way that its perception oscillates or flips involuntarily between, usually, two interpretations even though the retinal image remains constant, thus indicating that higher cortical processing are involved. Syn. reversible figure. See Blivet figure; Kanizsa figure; illusion; Necker cube; Rubin's vase; Schroeder's staircase.
Blivet figure An 'impossible' figure in which three apparently solid tubes are attached at one end of a rectangular base which projects only two bars (Fig. F4). See Necker cube; Schroeder's staircase; Rubin's vase.
fortification figure See scintillating scotoma.
Kanizsa figure An ambiguous figure in which the illusory contour of a square (or triangle) appears in the middle of four (or three) truncated solid squares (or circles). It is an illustration of the perceptual ability to make sense of an incomplete figure by creating a 'whole' image from the separate elements (Gestalt organization). Some people cannot perceive the contour. Syn. Kanizsa square (Fig. F5).reversible f. See ambiguous figure.
Fig. F4 Blivet figureenlarge picture
Fig. F4 Blivet figure
Fig. F5 Kanisza figureenlarge picture
Fig. F5 Kanisza figure
References in classic literature ?
Yard by yard the School- house have been driven back, contesting every inch of ground. The bull-dogs are the colour of mother earth from shoulder to ankle, except young Brooke, who has a marvellous knack of keeping his legs.
Crab strikes his heel into the ground, to mark the spot where the ball was caught, beyond which the school line may not advance; but there they stand, five deep, ready to rush the moment the ball touches the ground.
By and by Melanthius came out with a helmet in one hand, and an old dry-rotted shield in the other, which had been borne by Laertes when he was young, but which had been long since thrown aside, and the straps had become unsewn; on this the two seized him, dragged him back by the hair, and threw him struggling to the ground. They bent his hands and feet well behind his back, and bound them tight with a painful bond as Ulysses had told them; then they fastened a noose about his body and strung him up from a high pillar till he was close up to the rafters, and over him did you then vaunt, O swineherd Eumaeus saying, "Melanthius, you will pass the night on a soft bed as you deserve.
At first he made a hole in the ground two feet deep; this he filled with the dry wood that was so abundantly scattered about, where it had been strewn by the elephants, whose tracks could be seen where they had made their way through the forest.
One half, therefore, of the spear stuck fast like a charred stake in Antilochus's shield, while the other lay on the ground. Adamas then sought shelter under cover of his men, but Meriones followed after and hit him with a spear midway between the private parts and the navel, where a wound is particualrly painful to wretched mortals.
I shook him as little as I could help, but once or twice on the rough ground he called out, "Steady!
She quickened her pace and rose smoothly, just as he had fancied she would, and as she left the ground gave herself up to the force of her rush, which carried her far beyond the ditch; and with the same rhythm, without effort, with the same leg forward, Frou-Frou fell back into her pace again.
"Well, look at those hills which surround the main one where the site for the Castle was wisely chosen--on the highest ground. Take the others.
Hardly had the Prince touched the ground than he felt himself violently seized by an unseen power, and hurried away he knew not whither.
As the craft neared the building, and just before she struck, the Martian warriors swarmed upon her from the windows, and with their great spears eased the shock of the collision, and in a few moments they had thrown out grappling hooks and the big boat was being hauled to ground by their fellows below.
He crossed himself with an accustomed movement, bent till he touched the ground with his hand, and bowed his white head with a deep sigh.
THE cruiser Vanator careened through the tempest That she had not been dashed to the ground, or twisted by the force of the elements into tangled wreckage, was due entirely to the caprice of Nature.