Typographical Curiosity About Numbers

“Why do the digits look like they do?” to answer this recurrent question one may find on the web many strange and diverse theories on the origin of the shapes of our modern, Hindu-Arabic numerals. Unfortunately, most if not all of those theories are patently false! One that went viral claims: “Our present method of writing figures is based on an early Arabic geometric design (see below) where each digit contains its own number of corners or angles, for instance the digit 1 contains one angle, the digit 3 has three angles, the digit 7 has seven angles and so on.” It’s not an exaggeration to say that it’s just plain nonsense!number typo false

Let us leave aside these abstruse theories, as there are a whole range of serious and documented books on the origin of numbers, including Georges Ifrah’s excellent book “Universal History of Numbers“.
However, there is nothing preventing us from finding or inventing original and / or fun typographic methods to create numbers, like the one illustrated below, which requires only two stylized numerals: a 4 and a 8.

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Emerson’s Secret

When Crayola‘s senior designer Emerson Moser retired in 1990—after 37 glorious years of loyal service—he finally confessed to a little secret: he was color vision deficient! Moser went on to produce a record 1.4 billion crayons during his career…
While any type of color vision deficiency (color blindness) could make crayon production difficult, complete color vision deficiency, where someone can only see in shades of gray, is extremely rare. About 99% of color vision deficiency involves just the inability to distinguish between some pairs of complementary colors.
So, if you’re wondering about your own color vision, feel free to take the test on my website.

crayola crayons

TangraMagic Puzzle

Tangramagic puzzle

TangraMagic, a new manipulative puzzle for classrooms or just for fun..

This unique puzzle of my creation  is ideal for teaching math basic skills, problem solving and critical thinking in an exciting way! The vanishing geometrical effects will hold juniors and seniors’ attention. All the secret of this game is concealed in two numbers: 5 and square root of 7.
Tangramagic puzzle 2

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The visual art of concealing

In my book “Hidden Picture Puzzles“, I treat of hidden things in plain sight.

“Steganography” is the art and science of hiding a secret message within a larger one, in such a way that no one suspects its presence. The old Swiss banknotes offer some interesting examples of steganography. In the picture below you can see the back of a Swiss ten-franc bill. The small part surrounded by the blue square contains a microtext, if we strongly enlarge it we may read a short bio of the Swiss architect Le Corbusier both in German and in Romansch:

Le Corbusier hat als Architekt Urbanist maler und Theoretiker Bahnbrechende und Visionäre Anwendungen für den Wohn- und Städtebau verwirklicht…

Swiss bill

How many digits of π are needed in real life?

If you had a circle the size of the observable universe, and you wanted to compute its circumference with an accuracy equal to the size of a proton, the number of digits of π that you would need is only 43. NASA scientists, for instance, keep the space station operational with only 15 or 16 significant digits of pi… That means that on a day-to-day basis, you can ignore far more of them!