Nine fluffy penguin chicks stand out against the snow. But some much smaller chicks are peeking out from behind the group.
Pay special attention to the gaps between the larger birds and their sides. Count a chick even when only its little face is visible.
There are 13 baby penguins in this image: nine large chicks and four tiny hidden ones.
If you counted only nine the first time, have another look at the spaces around their bodies.
A familiar brain teaser asks how removing something can make it grow. The trick is to think about empty space.
Four pottery jugs have different shapes. Which one looks as though it could hold the largest volume of water?
These little squirrels are lined up for a charming counting challenge. Can you count them without getting distracted?
The classic face and hands riddle uses words with more than one meaning. The answer is hiding in everyday life.
Twelve antique brass doorknobs look almost identical. Compare the tiny floral decorations to spot the odd one.
An image celebrating a 105th birthday reminds us that each long life is made of stories, relationships and everyday joy.
