Combine the caterpillar with the plantain leaf in the inventory to make the eaten plantain leaf. Combine the soil with the mug of water in the inventory to get the mud. Drop the caterpillar to put it back on the leaf. Select the transition option on the Magic Generator and then press the blue button to see the available locations. Select the museum to travel there:

Talk to the director and he will say that a rare Nautilus Riverti shell has been stolen from the museum. Select the time travel option on the Magic Generator and then press the pink button to see the available locations. Select the cabin to travel there. Talk to the old woman to see a fishing rod. Take the fishing rod: