This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

What can you hold in your right hand, but never in your left hand?

What jumps when it walks and sits when it stands?

I don't get anymore wetter, no matter how much rain falls on me.

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?