The words “heaven”, “sky” and “cloud”, are used in both singular and plural forms, synonymously and interchangeably, in various verses of the Bible and across its different versions. For example,

Your love, Lord, reaches to the heavens, your faithfulness to the skies. (Psalm 36:5 New International Version). Thy mercy, O Lord, is in the heavens; and thy faithfulness reacheth unto the clouds. (Psalm 36:5 King James Version).

But the earth is considered distinctly apart and clouds are regarded more as an interface between heavens/skies and the earth. For example,

For as high as the heavens are above the earth, so great is his love for those who fear him. (Psalm 103:11 NIV). Sing unto the Lord with thanksgiving; sing praise upon the harp unto our God: Who covereth the heaven with clouds, who prepareth rain for the earth, who maketh grass to grow upon the mountains. (Psalm 147:7-8 KJV).

My sketch above, in oil pastels on paper, shows heaven and earth as two different domains. Heaven is high above the earth and depicted by red, orange, yellow and blue colours, representing power, radiance, holiness and mercy. The earth is depicted by black, purple, brown and green colours, representing sin, passion, worldliness and brevity of life. But the intervening dull gray space between the heavenly and earthly domains contains clouds which represent God’s attempt to bridge that divide. He is reaching out to humanity through his son and sending showers of blessing, love, mercy, truth, justice and faithfulness. Jesus ascended into heaven on a cloud at the end of his life on earth and he is going to return to earth again on a cloud when every eye will see him.