Wymyslna Sztuka is one of the missions in Far Cry: New Dawn where you look for Hidden treasures. This one is closely related to bandits. You need to get inside their guarded warehouse. Its location is marked on the map below:
This mission requires you to own Grapple perk.
There are only two bandits outside the barn. One of them is drawing on a wreck. The second is patrolling the area near the entrance. You shouldn't have problems with eliminating them.
Once the bandits are dead, reach the back of the building. You will find a tower. Climb it by using the Grapple. There is a rope at the top of it that will help you reach the barn's upper floor.
Once you are inside, crouch and enter the low corridor. Jump down and turn both valves located on the same floor. One of them opens the barn's door, the other moves one of the cars. This will allow you to jump to the opposite side of the floor. Find another valve - it will move the car that is blocking the passage. You can now enter the stash and collect all resources.