Is it possible to have an original thought?

Many of our thoughts are reactions to a singular external stimuli e.g. You see a flower and you might think "pink" or "beautiful." You see the ocean and might think "vast" or "moving."
Some thoughts are more complex and are reactions to memories of external stimuli and combined with other memories e.g. "Imagine an ocean made up entirely of undulating flowers."
But what about an original thought? A thought that's not a reaction to any external event or object. Is it possible to form a thought from nothing?

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CheshireCatalyst · 41-45, M

In a sensory deprivation chamber I guess? Then the only place your thoughts would be arriving from would be the darkness they are born in.

Magnolia · 31-35, F

You still have memories of external stimuli while in a sensory deprivation tank.

CheshireCatalyst · 41-45, M

@Magnolia: but combinations of our memories are inherently original. They are amalgams of things our perceptions have created.

Magnolia · 31-35, F

I see what you're getting at but I'm not talking about original combinations made up of unoriginal thoughts. I'm talking about a thought originating from inside your mind.