50 Optical Illusions (Usborne Activity Cards) (Puzzle Cards no pen)

I bought one of these before but it was taken by someone. The box is full of cards each containing a different optical illusion. What makes this set so great is that it has two cards each with a circle cut out of them and with a printed ruler. The circles can be placed over the images where it's hard to believe that the two areas are the same shade of colour.

These Usborne Optical Illusions cards are intriguing and attention-holding, with a certain mind-bending 'cool factor', making them of interest to curious kids, teens and adults alike.Some cards demonstrate that you cannot trust what your eyes are seeing! For example, two colours in a picture appear different but are in fact the same, or apparently over-lapping circles are not really overlapping at all. A 'revealer card' is included, which features a ruler edge and two holes to view colours through seperately, to prove certain illusions are true!There are 50 illusion cards, approx 15.5cm long, boldly coloured and with explanations of the illusions on the reverse of each card. Not every card is mind-blowing but there is a decent variety and overall this set makes up an interesting collection. Ideal for dipping in and out of, for travel and for showing friends.

Very good illusions cool

These are great! Second set I've bought as first set got worn out from over-use (in a school)

Very interesting 50 cards with optical illusions which will fascinate children up to many ages. Even adults are fascinated!!LOVELY item sure to last for a good long while as such things are perenniel

Some interesting illusion cards, others not as good but on the whole a nice little set for those interested in magic and illusions.

Bought these as part of a topic on optical illusions and popular art for 10/11 yr olds. They absolutely loved the cards and were amazed by how the human eye/brain can be tricked into seeing things that were not there. It contains a very wide selection from classic illusions like the faces/vase to impossible drawings and colour wheels that seem to rotate. Exceptional value for the amount of pleasure and information provided. Would make a great present for anyone of any age who likes to be entertained and amazed.

Great fun, big cards, nice print at the front and the explanation of the illusion at the back.