Too much energy to be harnessed

It is just a small observation or idea about the electromagnetic energy around us.

It started from a thought, just a simple thought that how many people can see a pen kr a face or a ball  at one time. Take this example. You are sitting in a lecture hall and the teacher writes tbe alphabet ' A ' on tbe blackboard using a chalk.

Now if there are 100 students sitting in the hall all if tbem are able to see the alphabet 'A'. Now there are two thi gs to consider 

1. The colour of the alphabet on blackboard is due to the absorption of some wavelengths of  light falling in it and the reflection if other wavelengths. For example leaves appear green due to absorption of blue light by chlorophyll and reflection of other wavelengths.

2. The number if students that see the alphabet is hundred. Now replace the students with just heads lying one over other. Also the heads see it through their eyes ie the light entering the pupil. 

So there are 200 pupils (of eye) that see the alphabet. 

If we replace the heads by eyes there would be so many eyes that see the alphabet. About 1000 eyes and if the eyes are replaced by just a pupil there will be about 4000 pupils. Each of the pupil receiving so many photons per second. Each recieving so much energy per second. 

One major fact is that a loght of photons are absorbed and reflected and diffracted by the molecules in between the pupils and the alphabet. 

So this suggests ts that a small alphabet transfers just too much energy. 

And there is a lot more of this energy around us. 

Also what i have focused here is just the visible spectrum. But the electromagnetic spectrum is much wide and there are other radiations also. Also there are magnetic fields and electric fields that exist independent of each other. 

What i believe is that this energy can be harnessed. Maybe not today but some day in future. Now almost every object that we see reflects or emmits electromagnetic radiations. 

Now what if you could harness the energy that js present in your bsthroom or kitchen, like the one being reflected from walls, utensils etc. 

This all harnessed energy can be used to successfully use the energy demanding technologies like the blockchain technology without any concern.