Scrutinising tree trunks may not be your favourite activity, but it’s well worth the detour. Bark protects trees from the outside world. Its appearance varies according to species and age. It can be wrinkled, cracked or multicoloured. Of course, the colours of exotic trees may be brighter and more surprising. But they’re all worth a closer look. Photographer Cédric Pollet is convinced of this. He has devoted a trilogy to them.