The most common and most likely answer to this crossword clue is the 6 letter word NAVELS
I've seen this crossword clue in The Guardian
N
A
V
E
L
S
Buddy explains!

The straight part
We know that "Objects of contemplation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case objects of contemplation = navels.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does NAVELS mean?
NAVELS noun- The indentation or bump remaining in the abdomen of mammals where the umbilical cord was attached before birth.
- The central part or point of anything; the middle.
- A navel orange.
- An eye on the underside of a carronade for securing it to a carriage.