2. Matching puzzle pieces to pictures

The next level of difficulty is to match the 3D puzzle pieces with flat pictures, first large pictures on the key card, then smaller pictures on the Flash Cards used for measurement of visual acuity at a distance of 1-3 meters.

"Which picture do we have here?.. and which piece would you put on this?"
"You have cards."
"Yes, these are cards. Now we have so small picture... then we can turn the card, there is another picture on the other side. What is this picture?"

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