In fact, when your organs of sense encounter an object, the only part the object itself plays is to initiate the process of perception in your consciousness. From then on, as your mind reacts to the object, influenced by all your accumulated habits and past experiences, the whole process is entirely subjective. So, when your mind is full of anger, the whole world seems to be a hell realm. When your mind is peaceful, free from any clinging or fixation, and whatever you do is in accordance with the teachings, you experience everything as primordially pure. While a Buddha sees the hells as a paradise, deluded beings see a paradise as the hells.
Our perceptions are colored by delusions in the same way that the vision of a person with jaundice is colored by the bile in his eyes, making him see a white conch as yellow. It is clinging that makes the mind project its delusions onto appearances. As soon as the mind perceives something, it clings to that perception; then it appraises the object as being desirable, offensive, or neutral; finally, taking action on the basis of this distorted perception with desire, aversion, or indifference, it accumulates karma.
From: "The Heart Treasure of the Enlightened Ones"