Context: In the first volume of his Parerga and Paralipomena, Schopenhauer wrote his "Sketch of a History of the Doctrine of the Ideal and the Real". He defined the ideal as being mental pictures that constitute subjective knowledge. The ideal, for him, is what can be attributed to our own minds. The images in our head are what comprise the ideal. Schopenhauer emphasized that we are restricted to our own consciousness. The world that appears is only a representation or mental picture of objects. We directly and immediately know only representations. All objects that are external to the mind are known indirectly through the mediation of our mind. He offered a history of the concept of the "ideal" as "ideational" or "existing in the mind as an image".

Question: Who wrote Parerga and Paralipomena?
Answer: Schopenhauer

Question: According to Schopenhauer, to what can the ideal be attributed?
Answer: our own minds

Question: What did Schopenhauer believe we were restricted to?
Answer: our own consciousness

Question: What did Schopenhauer believe were the only things we could know?
Answer: representations

Question: What type of knowledge did Schopenhauer believe the ideal to be?
Answer: subjective

Question: What essay is in Schopenhauer's second volume?
Answer: Unanswerable

Question: What are we unrestricted by?
Answer: Unanswerable

Question: How are external objects known directly?
Answer: Unanswerable

Question: What constitutes mental pictures?
Answer: Unanswerable

Question: Schopenhauer said the ideal was not what type of knowledge?
Answer: Unanswerable