Modals of Deduction

Look at the following optical illusions. Can you find...? 

8 people  / 3 animals   /   An old lady   /   A word   /  Parallel  lines / Five young ladies /  A musical instrument   

            

Reading

Modals Of Deduction Explanation and Exercises

http://learnenglish.britishcouncil.org/intermediate-grammar/modals-deductions-about-the-present

https://learnenglishteens.britishcouncil.org/grammar/intermediate-grammar/modals-deduction