Concave Collection

Hollow-face illusion, artwork
Hollow-face illusion, computer artwork. This is an optical illusion where the perception of a concave (hollow) mask of a face appears as a normal convex (protruding) face

Hollow-face illusion, artwork
Hollow-face illusion, computer artwork. This is an optical illusion where the perception of a concave (hollow) mask of a face appears as a normal convex (protruding) face

A family enjoying a magic lantern show
5311943 A family enjoying a magic lantern show; (add.info.: Engraving depicting a family enjoying a magic lantern show. The apparatus here differs little from that of Kircher in the 17th century)

Natural Philosophy, 1878 (engraving)
1574797 Natural Philosophy, 1878 (engraving); (add.info.: Boy lighting paper using the sun's rays focused by a concave mirror. Engraving from ''Natural Philosophy'' by E)

An audience enjoying a magic lantern show
5311937 An audience enjoying a magic lantern show; (add.info.: Engraving depicting an audience enjoying a magic lantern show)

Engraving depicting a concave mirror being used, 19th century
5309419 Engraving depicting a concave mirror being used, 19th century; (add.info.: Engraving depicting a concave mirror being used. Dated 19th century 01/02/1887); Universal History Archive/UIG.

Concave Terracotta Sculpture, Ptolemaic Period-Roman Period (305 BCE-337 CE). Creator: Unknown
Concave Terracotta Sculpture, Ptolemaic Period-Roman Period (305 BCE-337 CE)

Cross section illustrations of human eyes with concave and concave lenses looking at green tree
Arrow Sign, Astigmatism, Biomedical Illustration, Concave, Convex, Cross Section, Direction, Directly Above, Eyesight, Focus, Green, Human Eye, Lens, Light, Long, Looking, No People, Part Of

Carl Zeiss Jena Concave Mirror Lens - Searchlights
Carl Zeiss Jena Concave Mirror Lens for large electric headlamps (searchlights) which used these 2m wide parabolic reflectors. Date: 1926

RMS Titanic - cigar case recovered by CS Mackay-Bennett
RMS Titanic - from inventory of items recovered from bodies by cable ship Mackay-Bennett - a silver cigar case of rectangular outline with rounded corners

Circular Desk, c. 1936. Creator: Cornelius Frazier
Circular Desk, c. 1936

Pyxis (Container for Personal Objects), 450-440 BCE. Creator: Euaion Painter
Pyxis (Container for Personal Objects), 450-440 BCE

Broad Pear-Shaped Jar with Concave Lid, Tang dynasty (618-907), 8th century

Mbulu Ngulu, A Kota Reliquary Figure (brass, copper & iron)
CH450390 Mbulu Ngulu, A Kota Reliquary Figure (brass, copper & iron) by African School, (19th Century); height: 51 cm; Private Collection; Photo eChristies Images; African, out of copyright

Chiswick, first design for the Exedra (pen & ink and wash on paper)
5926017 Chiswick, first design for the Exedra (pen & ink and wash on paper) by Kent, William (1684-1748); 32.9x51.5 cm; eThe Devonshire Collections, Chatsworth; (add.info.: Not carried out)

Church Santa Maria della Pace, facade, 1656
ALI414904 Church Santa Maria della Pace, facade, 1656 by Cortona, Pietro da (Berrettini) (1596-1669); Rome, Italy; (add.info.: Eglise; b/w photo; black and white photograph; ); Alinari

Ancient concave roundel with umbo or spike
Views of an ancient concave roundel with umbo or spike made of leather skins, iron plate and brass nails. Copperplate engraving by J

Roundel, battle axe and pole axe
Concave roundel 1, 2, battle axe 3, 4, pole axe 5, 6, and curious ancient weapon used by the English against the Scots 7, 8. Copperplate engraving by J

Mbulu Ngulu, A Kota Reliquary Figure (brass & copper)
CH450391 Mbulu Ngulu, A Kota Reliquary Figure (brass & copper) by African School, (19th Century); height: 48.5 cm; Private Collection; Photo eChristies Images; African, out of copyright

Page from The Architect s, Surveyors and Engineers Compendium 1892 (engraving)
3092735 Page from The Architect s, Surveyors and Engineers Compendium 1892 (engraving) by English School, (19th century); Private Collection; (add.info.: Page from The Architect s)

Temple of Venus, High Imperial Period (27 BC-395 AD) (photo)
GDG279563 Temple of Venus, High Imperial Period (27 BC-395 AD) (photo) by Roman Imperial Period (27 BC-476 AD); Baalbek, Lebanon; (add.info.: colonne; colonnes; built late 02nd century AD)

The big web
Luc Vangindertael (laGrange)

Concave Lozenge-shaped Panel and Grotesque Figures, ca. 1620-30. Creator: Noel Rouillard
Concave Lozenge-shaped Panel and Grotesque Figures, ca. 1620-30

Doctor Convex and Lady Concave, November 20, 1802. November 20, 1802
Doctor Convex and Lady Concave, November 20, 1802

Open umbrella blown upwards from convex into concave shape by strong wind, side view

A Highland Target Or Targe, With Spikes. From The British Army: Its Origins, Progress And Equipment, Published 1868

The Pan Formation of Tessellated Pavement, Lufra, Eaglehawk Neck, Tasmania, Australia
Tessellated pavement is a relatively flat rock surface that is subdivided into more or less regular rectangles, blocks approaching rectangles, or irregular or regular polygons by fractures

Conceptual image of platelet, red blood cell and white blood cell

Christmas card in the shape of a pink parasol, with swallows and green foliage. Date: circa 1890s

Mirror Lapper. Machine designed by Leonardo. Codex Atlanticu
Mirror Lapper. Machine by to the manufacturing of concave mirrors. During the Renaissance, mirrors are obtained by smoothing carefully bronze, copper or silver surfaces until they reflect perfectly

Concave heath, Erica concava.. Handcoloured copperplate engraving drawn by John Curtis and engraved by Weddell from Curtiss Botanical Magazine, 1820, Samuel Curtis, Walworth, London

Army ground radar antennae on display on Ford Island as part of a large Rim of the Pacific Exercise (RIMPAC) held in the Oahu, Hawaii

A technician climbs up a large radio telescope antenna
November 18, 2009 - A technician climbs up a 28-foot radio telescope antenna at the Sagamore Hill Solar Observatory, Massachusetts, to perform a semi-annual corrosion control inspection

A radar dish aboard Mobile At-Sea Sensor barge
Pearl Harbor, August 24, 2011 - A radar dish aboard Mobile At-Sea Sensor (MATSS) barge (IX-524) undergoes final testing before upcoming flight test mission FTM-16

The Lovell Telescope at Jodrell Bank Observatory in Cheshire, England
The Lovell Telescope is a radio telescope at Jodrell Bank Observatory in Cheshire, England

Blood flow through a relaxed artery verus an artery in spasm

Cancer cell with red blood cell flow

Insertion of balloon into atherosclerotic artery

Arteries on heart showing atherosclerotic plaque in an artery

Microscopic view of blood clotting inside the artery

Artery cross-section with blood flow and stent deployment
Microscopic view of an artery cross-section with blood flow and stent deployment

Good and bad cholesterol found in blood stream

African trypanosomiasis in the red blood cells. African trypanosomiasis, also known as sleeping sickness, is a parasitic infection caused by protozoa

Conceptual image of ebola virus in blood stream

Microscopic view of red blood cells

Red blood cells with leukocytes

Microscopic view of blood cells with virus

Interior view of heart with detail of muscle cells and atherosclerotic artery. Chest x-ray in background

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"Exploring the Enigmatic World of Concave: Unveiling Illusions and Artistic Marvels" Step into a realm where reality bends and perceptions deceive. Concave, a concept that transcends mere curvature, takes us on a captivating journey through hollow-face illusions and mesmerizing artwork. Delve into the enigma of the Hollow-face illusion, where concave surfaces play tricks on our minds. As we gaze upon these artworks, faces seem to protrude outwards when in fact they are inwardly curved. A testament to the intricate workings of human perception. Intriguing artifacts from history also bear witness to the allure of concavity. The RMS Titanic's cigar case recovered by CS Mackay-Bennett reminds us how even amidst tragedy, objects can hold stories within their concave depths. The Carl Zeiss Jena Concave Mirror Lens illuminates distant horizons with its searchlights. This technological marvel harnesses the power of concavity to focus light beams towards specific targets, guiding ships safely through treacherous waters. Travel back in time as you encounter Cornelius Frazier's Circular Desk from 1936; an embodiment of sleek design with its smooth curves and concave surface inviting creativity to flow effortlessly. Ancient civilizations too embraced this captivating form. The Pyxis container crafted by Euaion Painter in 450-440 BCE showcases delicate craftsmanship fused with a subtle yet alluring concavity that once held personal treasures close at hand. Witness Tang dynasty's Broad Pear-Shaped Jar adorned with a meticulously carved lid boasting an enticing concave shape; it stands as a testament to ancient Chinese artistry and practicality merged seamlessly together. Marvel at Mbulu Ngulu, an awe-inspiring Kota Reliquary Figure made from brass, copper & iron. Its striking presence emanates from its expertly sculpted body featuring intricate patterns accentuated by strategically placed convexities and intriguing concavities.