Different animals manifest different modes of perception
Similar differences are seen among individual humans
For the same human, information perceived with the senses is self-contradictory
Furthermore, it varies from time to time with physical changes
In addition, this data differs according to local relations
Objects are known only indirectly through the medium of air, moisture, etc. and sunshine!
These objects are in a condition of perpetual change in colour, temperature, size and motion
All perceptions are relative and interact one upon another
Our impressions become less critical through repetition and custom
All humans are brought up with different beliefs, under different laws and social conditions