Question

once upon a time son they used to laugh with their hearts and laungh with there eyes but now they only laugh with their teeth , while their ice block cold eyes search behind my shadow lesson 25

Answer 1

eyes of a man speaks well of their feelings in their heart 
and this applies for every human .....actually not only humans but its the same also for animals
ice block cold eyes shows the use of a metaphor
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hope this helps
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Answer 2

Answer:

The human eyes reveal the feelings and emotions of man.

The figure of speech used is metaphor. Their eyes are cold and emotionless. They are devoid of genuine warmth and humanity.