The allusion in this passage is the reference to Pablo Ruiz Picasso who was a notable Spanish painter, sculptor, and printmaker.
The two ideas that are connected in this allusion are:
Allusion is the reference to something or someone notable with the intent of calling to mind something.
In this passage, the teacher made an allusion to a successful Spanish artist named Pablo Ruiz Picasso.
He hopes that his student takes after his artistic talents and become successful like him.
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