"Our senses are limited. We 'see' only some wavelengths of light ;
we 'smell' only a range of odours; we 'hear' only a range of sounds.
If we see nothing, then this does not mean that nothing is there.
The extents of our senses, both quantitatively and qualitatively, are also the results of an adaptive selection process that must allocate scarce resources.
We could have evolved eyes that were thousands of times more sensitive, but that ability would need to have been paid for by using resources that could have been used elsewhere.
We have ended up with a package of senses that makes efficient use of the scarce resources available." - John D. Barrow
Although human senses are limited they are truly quite magnificent.
A human with normally functioning senses can;
feel on the fingertips or face a pressure that depresses the skin a .00004 inch,
feel the weight of a bee's wing falling on the cheek from less than half an inch away,
a small candle flame
from 30 miles
away on a clear, dark night,
distinguish among more than 300,000 different color variations,
one drop of perfume
diffused through a three-room apartment,
taste .04 ounce-of table salt dissolved in 530 quarts of water,
gauge the direction of a sound's origin based on a .00003 second difference in its arrival from one ear to the other.