The greatest challenge was the creation of the futuristic vision of Marty's hometown in 2015. Production designer Rick Carter wanted to create a very detailed image with a different tone from the film "Blade Runner", wishing to get past the smoke and chrome. Carter and his crew spent months plotting, planning, and preparing Hill Valley's transformation into a city of the future. Visual effects art director John Bell stated they had no script to work with, only the indications that the setting would be 30 years into the future featuring "something called hoverboards".