Thinking is a solitary experience. Whether it is done in a crowd or on an isolated mountain top, it makes no difference. It is part of one’s interpretation of whatever their situation is, defined by self-awareness and how past memories interact with the present.
Solitary thinking is usually most effective in an isolated environment, free from distractions whatever they may be. Most people know instinctively when they have reached this state, it varies from person to person, though the pull is the same. It is felt biologically as a need for self nourishment, a time to recharge and allow one’s thoughts to wander, sometimes whimsically or morose. During those private moments one is able to let go and let their imagination run wild.
Dreaming, also a solitary experience, is another plane of existence we all go to and spend time in our internal reality that contains recognizable symbols in illogical patterns. It also taps into our emotional nature and feelings, recent or embedded within our subconscious, that remains unresolved.
The downside to solitary thinking is that it is very easy to get caught up in a pattern of regurgitating the same ideas in a circular pattern. The paradox is that it is more difficult to find an answer, in which case it becomes a trap. A new perception is needed, but the only way to get one is to interact with life in what ever way one chooses is right for them. That itself may not lead to an insight. It will depend on new elements introduced into one’s thinking. Then, thoughts will spiral to illumination rather then continue to flow in a circle. At this point any insight is an answer that will inevitably unfold more questions revealing a cascade of unanticipated answers, best perceived when one is ready.