Jai Srimannarayana! Items identified as Ra:jasic, Tha:masic or sa:twic did not come from blue or were imported from Trisanku Swarga. All these are available stuff from our world only.
Classification was done depending upon the action they show on human mind when consumed
Some, may be good to the body but not to the mind. Hence, they were considered as ta:masic.
Onion or Garlic is the best example. Both are good to the body, but not to the mind.
For animal kingdom body growth and protection are priority.
Whereas for man, body is useless when mind is not in sound health.
Even when body is not at all in good use, but mind is in good condition, it is valued much like great scientist of the era Mr. Stephen Hawkins.
Those items which are bad by their progeny, are considered tha:masic. (ex – meat, onion etc.)
Whereas, items which become bad by external influences are ra:jasic. (fall of unwanted stuff dust/insects/hair/nails etc., on food items, items owned by evil people or given to us with bad intention etc.)
To see such items superficially look good, but their influence on mind is unavoidable. Hence, they are avoided by people who aspire in keeping their mind pure with positive energy or sa:twic.
=chinnajeeyar=