Visual illusions

3 perfect squares.



Mind teaser: Which dot is bigger?

Look carefully at the center dots on both the left and right.

Which dot is bigger??


Neither! They are both exactly the same size.

Message in the code

44 33 555 555 666 9 666 777 555 3

What is the message in this code?


Pressing these digits in sequence will produce HELLO WORLD on a cell phone (for an SMS text message).

Mind teaser: 4 and 8

It is quite interesting that all numbers can be created by using only two numerals – 4 and 8.


Mind teaser: Eye illusion

Have you ever noticed a hidden arrow in the FedEx logo? It stands for speed and precision. Check the space between “E” and “x”.

FedEx Express

Mind Teaser: Expand your mind

The 18…

I predict that your result will be 18

  • Think of a number.
  • Add 7 to it.
  • Subtract 2.
  • Subtract your original number.
  • Multiply by 4.
  • Subtract 2.


This problem gives the illusion of guessing an unknown number, but the unknown has been cancelled mathematically.
( X + 7 – 2 – X ) × 4 – 2 = 18


Eye Illusion!!

See this. The motion is just an eye illusion.


What Word…


There is a common English word that is nine letters long. Each time you remove a letter from it, it still remains an English word – from nine letters right down to a single letter. What is the original word, and what are the words that it becomes after removing one letter at a time?


The base word is Startling – starting – staring – string – sting – sing – sin – in – I

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