If you’ve seen the blue trees around town (not sad trees, but actually painted blue), you have encountered the newest art installation sponsored by the Denver Theatre District. The Blue Trees Family Fun Day is set for Sunday, May 21 at Skyline Park. From 10 a.m. to 5 p.m., families can color 200 child-size trees, participate in environmentally-friendly educational activities and enjoy kid-friendly entertainment. Konstantin Dimopoulos’ The Blue Trees art installation is about global deforestation and the importance of trees to people and their environment uses a biologically-safe, water-based, non-permanent colorant. Dimopoulos’ performance work uses trees as the canvas, calling attention to the fleeting quality of nature and raising social consciousness about interactions with the natural world.