When a system's energy is defined as the sum of its "useful" energy, (e.g. that used to push a piston), and its "useless energy", i.e. that energy which cannot be used for external work, then entropy may be (most concretely) visualized as the "scrap" or "useless" energy.
In an isolated system(my room) such as my study table(low energy) and my book rack(high energy) taken together, the dispersal of books(energy) from warmer to cooler always results in a net increase in entropy.
This basically means that the amount of scrap or junk increases if the system is left to itself. My study table is largely uncontrolled and is left all to itself. In this scenario, the junk on my study table increase with time.
If I take efforts to ensure that the books are placed in appropriate places, the disparity in energy levels (books) will be maintained. If I don't do that, the disorganized stack of books (energy) on my table will increase. This basically proves that the entropy (chaos) increase with time, if the system is left uncontrolled.
Also, it iw worth noting that 'Spontaneous changes occur with an increase in entropy'. The entropy of my room would increase to cross the bearable limits. When it becomes unbearable, one day this entropy (chaos) triggers spontaneously an impulse to clean up my study table. The spontaneous change occurs to reduce the entropy in the system called my room.
The energy and efforts required to clean up my table will equal the efforts required to manage my table and rack daily. Thus adhering to the concept of law of conservation of energy.
