Optical illusions questions This is a list of recently added questions about optical illusions. Play optical illusions quiz and see all the questions. Which continent is that?Africa. This map of Africa is rotated so the continent shape resembles Australia.Created by: globalquiz.orgcontinents riddles »hard 47% AustraliaAustralia5518AsiaAsia528AfricaAfrica5764North AmericaNorth America308 Which continent is that?Australia. This is Australia map, with north at the bottom side.Created by: globalquiz.orgillusions riddles »easy 70% North AmericaNorth America1811South AmericaSouth America620AsiaAsia2463AustraliaAustralia11771 How many dots at the intersections are black?None. In this scintillating grid illusion, dark dots seem to appear and disappear randomly. Various theories have been proposed to explain it. It may be caused by the mechanism of lateral inhibition (the capacity of an excited neuron to reduce the activity of its neighbors).Created by: Steve Lambertytechnology riddles »very easy 86% 10%10%19525%25%36550%50%956NoneNone9953 Which orange circle is larger?Both are the same size. This is known Ebbinghaus illusion. Although commonly thought of as an illusion of size, recent work suggests that the critical factor in the illusion is not the size, but the distance of the surrounding circles. In a similar way, the Moon appears larger on clear sky when it's close to the horizon line.Created by: globalquiz.orgtechnology riddles »very easy 86% the one on the leftthe one on the left275the one on the rightthe one on the right1162both are the same sizeboth are the same size11524the first one you look atthe first one you look at389 Whose face has been combined with Albert Einstein in this hybrid image?Marylin Monroe. A Hybrid Image is an optical illusion developed at MIT in which an image can be interpreted in one of two different ways depending on viewing distance. In order to see Marylin clearly, you need to move away of the screenCreated by: Cleotechnology riddles »easy 77% Kim BasingerKim Basinger341MadonnaMadonna956Marylin MonroeMarylin Monroe9636Woody AllenWoody Allen1556 How is this polygon called? (the one over the circles)Square. In this Ehrenstein illusion the sides of a square placed inside a pattern of concentric circles take an apparent curved shape. But in reality, the sides are straight.Created by: Debbie Foxgeometry riddles »easy 74% squaresquare15147rhomboidrhomboid2099concave squareconcave square1756concave rhomboidconcave rhomboid1200 Which shape is larger?None of them. Both shapes are the same, but the bottom one is placed more to the right. This is however difficult to notice. It is known as Jastrow Illusion.Created by: globalquiz.orgmathematics riddles »average 61% AA641BB3945None of themNone of them11423Both are largerBoth are larger2711 Which line is the longest?All are the same. This illusion has a long research history. It seems that people living in urbanized areas perceive the lines as representing the corners of rectilinear objects viewed in perspective, being more susceptible to illusion than people from rural areas.Created by: globalquiz.orgtechnology riddles »very easy 85% AA373BB1208CC221All are the sameAll are the same10808 Which of the lines on the right, is the continuation of the black line on the left?Red one. This is known as Poggendorff illusion, first described in 1860. Many detailed studies of the illusion point to its principal cause: acute angles in the figure are seen by viewers as expanded.Created by: globalquiz.orgtechnology riddles »hard 46% red onered one3372blue oneblue one1625none of themnone of them1328both of themboth of them851 Which lines are parallel?Green, blue and red. This is a well known Zöllner illusion, first described in 1860. It may be caused by this impression of depth. The black lines are parallel, too!Created by: globalquiz.orgtechnology riddles »average 69% blue and red onlyblue and red only558green and red onlygreen and red only1056green, blue and redgreen, blue and red7893nonenone1791 Play technology quiz and see all the questions.