My students LOVED this lesson. Perspective is part magic and part math and for creative types like me, there are specific rules that really work. My students discovered these as we worked through the lesson. About half of my fifth grade class finished this lesson in three, 50-minute sessions. The other half need an additional 30 minutes to finish.
Beautiful digital art you could display in your classroom to facilitate discussion about global warming. You could present one of images and ask the students what they think it's trying to convey, no text is needed to spark discussion. Great way to get students interested and engaged in the topic.