If you know Chinese character, you know each character or its component is a picture. The character 天 is 一大。大 is picture of a man，空 could be 穴工。
Those pictures did not come with instructions. No one left us a dictionary that gave us definitive answer to what these pictures are, but there are enough pictures and characters, words and writings and these allow us to decipher them.
It is not difficult to see the man in the image of 天 but it is not impossible to see the picture 工 on top of 大 the image of man. 天 is the personified Heaven which in Hebrew is Ha’shamayim, “shamayim” is sky which is also 天。
“Hashamayim” (הַשָּׁמַיִם) is Hebrew for “the heavens” or “the sky”
What is the difference between 天 and 空? Both mean sky..
天 is sky，but sky is better referred to as 天空，空 is not sky but is “nothing” and 天空 is sky with “nothing” and it is vast which is 大.
Difference between 天 and (天)空？Both are 大 one is an image of man the other has image of 工 which could be what is pictured above the image of man which is 大。
We were given this …. 天 is 「一大，至高无上 」he is the most high. 空 is nothing.