I close my eyes and see a flock of birds. The vision lasts a second or perhaps less; I don’t know how many birds I saw. Were they a definite or an indefinite number? This problem involves the question of the existence of God. If God exists, the number is definite, because how many birds I saw is known to God. If God does not exist, the number is indefinite, because nobody was able to take count. In this case, I saw fewer than ten birds (let’s say) and more than one; but I did not see nine, eight, seven, six, five, four, three, or two birds. I saw a number between ten and one, but not nine, eight, seven, six, five, etc. That number, as a whole number, is inconceivable; ergo, God exists.
—Jorge Luis Borges from El Hacedor
As for imagination, that could be a result of God. If you look for a maker (El Hacedor) then you must find one. It is all about cause and effect. The problem is that the first cause can never be found. Because when you find it you must ask, where did it come from? Unless you accept that God or the first cause is incomprehensible to mere humans. Then:
God (or the First Cause) is the only incomprehensible thing in the Universe.
The Spark from which imagination emanates is incomprehensible.
The conclusion: This Spark is connected to or has the same nature as God (or, once again, the First Cause).
This would imply that we ourselves are God. So by imagining birds are we proving the existence of ourselves?