A big grey wall encloses a small grey world. Colour is but a memory. A dream. Here live Yellowgrommel and Bluegrommel – the last colours left. Then comes a day, different from the ordinary grommely grommelday… The whispers of the little wall-men become a whirlwind. The grommels get lost…What happens when opposites find each other? And what is waiting beyond that wall? Join us on a playful adventure as we discover how nature’s colours can grow inside all of us.