Featured Topic: Miners and the Mining Industry
Koolen was a man who was socially involved. He was interested in the working class: the peasant life, the workers in the industry.
One of the interesting topics that are shown here is the mining industry and the work of the miners.
Around 1958 he made an extensive documentation consisting of paintings and drawings of the mining industry. He shows especially the very heavy work and life of the miner in narrow pillar rooms at the coal face.
Religiously speaking Koolen was rather liberal but he was very often inspired by biblical stories. These works are sometimes in dark tones but refined and often executed in powerful brushstrokes.
Refinement can be seen in a series of Madonnas, on the other hand large paintings with scenes from the Old and New Testament.