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Apple or Orange Tree Optical Illusion

9/22/2015

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Is this an apple tree or an orange tree. The only way to find out is to stare at the red dot for thirty seconds and then look at a white wall or ceiling and maybe keep blinking.
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Horizontal Lines Optical Illusion

9/21/2015

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Headline Fail Optical Illusion

9/19/2015

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Very Rude Fish Optical Illusion

9/17/2015

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This fish illusion has been floating around (see what I did there) for a few years but until now never made it into the Optical Spy database. Source unknown
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Color Changing Sand Dunes Optical Illusion

9/16/2015

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Stare intently at the white dot between the Green & Red tiles for 30 seconds and then look at the white dot between the dunes. Source TEDTalks
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Dripping Red Table Optical Illusion

9/15/2015

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Superman Elevator Animation

9/14/2015

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Dirty Harry Optical Illusion

9/13/2015

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Beam Animation Optical Illusion

9/12/2015

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Descent or Reflection Optical Illusion

9/10/2015

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Source ducode
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Young Lady with Old Man Optical Illusion

9/9/2015

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Source Illusionware
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3 Famous Optical Illusions Explained

9/8/2015

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Dominoes Optical Illusion

9/7/2015

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Relativitivity

9/6/2015

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We thought it might be fun to expand Escher's relativity. 
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The Princess Bride Ambigram Optical Illusion

9/4/2015

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Hover to invert 
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Disappearing Balls Optical Illusion

9/3/2015

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If you stare intently at the center pink spot the blue dots will start disappearing.
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Pavement Optical Illusion Injures 20 People

9/2/2015

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A pavement installed in a Welsh town which creates an optical illusion that hides a kerb has caused at least 20 people to trip so badly that they needed to be taken to hospital.
Source: Daily Telegraph
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Car Parking Optical Illusion

9/1/2015

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Stare at the black dot in the third car on the right for 30 seconds or more then your eyes will create a black car that you might be able to "park" between the other two, if you have good eye coordination.
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Liquid Illusions

8/30/2015

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Scottish Agates Optical Illusion

8/30/2015

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A variety of spectacular Scottish agates from Alan Mason.
The titles of the illustrations are my own, but the details are from “Agates” by A C Bishop and W D I Rolfe, published by National Museum of Scotland and British Museum (Natural History), 1989.

At the time of publishing, Bishop was Deputy Director and Keeper of Mineralogy at B M (N H), and Rolfe was Keeper of Geology N M S.

  1. “Fireworks”, a sagenitic agate from Dunbog in Fife. “Sagenitic” means containing sprays of fine tubules of chalcedony, a variety of quartz. (Fig.90, p 41)
  2. “Tornado Approaching”, illustrating “tube of escape”, “rent” and “agate dyke”, technical terms in the formation of agates. (Fig.28, p 13)
  3. “The Great Ogre”, a stalactitic and fortification Blue Hole agate. “Stalactitic” means that there were hanging pendants, during agate formation, looking like cave stalactites. “Fortification” means that there are sharp changes of angle in parallel lines, like the plan of a 17 to 18 C fortress. Blue Hole was an agate collecting site near the port of Montrose on the NE Scottish coast. (Fig. 54, p 25)
  4. “Waves off the Island”, an agate from Ballindean. This reminds me of an aerial view of a triangular island experiencing a steady swell of waves. Ballindean is a coastal region in the Firth of Tay near the village of Inchture.  (Fig. 73, p 35)
  5. “Volcanic Eruption”, is an agate from Binn Hill. Although it has been described as a “rising sun” agate, this seems too prosaic. Binn Hill is an inland site, near Glenfarg, about 8 miles, (12 Km) south of Perth. (Fig. 80, p 37)
  6. “Storm Clouds”, a scenic agate from Heads of Ayr, a promontory on the west coast of Scotland, about 6 miles (10 Km) SW of the port of Ayr. “Scenic” agates resemble landscapes and seascapes (Fig. 105, p 48)
  7. “The Ice Caves”, an agate from Norman’s Law, an inland site on a hill, 935 feet (285 m) high and about 6 miles (10 Km) NW of Cupar, Fife, in NE Scotland. (Fig. 81, p 38)
  8. “The Bacon Cave”, a “thunder egg” agate from Oregon, USA. The name comes from a Native American folk tale about the origins of the egg-shaped stones. (Fig. 160, p 67)
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Street Painter Optical illusion

8/29/2015

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Lip Leaf Optical Illusion

8/28/2015

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Image source: unknown
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Falling Down Optical Illusion

8/27/2015

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Candlestick Face Optical Illusion

8/26/2015

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Original image source: unknown - Animation by Optical Spy
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Rock Optical Illusion

8/25/2015

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In this lovely Scottish rock specimen of Marine Agate (probably born in bubbles in basalts that were erupted some 400 million years ago during the closure of the Iapetus Ocean) it looks like we are looking through a window into a mysterious beach world on a misty dawn, looking over a calm bay towards distant hills on the other side. In fact it is just the beautiful colors inside the rock.
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