B"H
In Kabbalah, the color orange represents the attribute of Yesod, while blue represents Malchut. In art, orange and blue and complementary colors, just as Yesod and Malchut are also complementary in Kabbalah. The two reinforce each other, bring out the best in each otber.
It's interesting that orange appears to be the color most prevalent in connection to Gaza: the color of the Gush Katif movement, the color of the movement to release the Bibas family, and the color most associated with the current American president (whether it be the orange vest that became the symbol of his campaign, or simply the tone of his skin).
PS: Here is an interesting source for those interested in Kabbalah and art: https://www.kabbalahart.com/gallery/50-gates-of-bina/
