This gate decides whether the colour palette is usable, so that the painting phase can build on it. The palette must come from the reference image through colorgram, must contain no white shades, and the toolchain it depends on (colorgram and the turtle graphical toolkit) must work on the developer machine.
This gate decides whether the program draws the finished painting as the Business Case requires: a 10 by 10 grid of 100 dots of size 20 spaced 50 units apart, each coloured at random from the palette, left on screen until a click, with the turtle hidden and no trail between dots, and drawn in 30 seconds or less.