This cross appears to have two halves - the hydrometer and the rainbow; the romance and the settling down.
Looking at the hydrometer-rainbow pair, the hydrometer is defined as a tool that measures “the relative density of liquids based on the concept of buoyancy” according to Wikipedia. As rainbows are an effect of light moving through rain, we know that they would measure as most buoyant - in effect, a metaphor for joy in the range of emotions (water is a metaphor for emotions).
Looking at the Spaniard-Indians pair, the Taurean romance seems to result in settling down and making camp after a nomadic period. The whole cross describes romantic love (Taurus), joy (Leo), contentment/settling/nesting (Scorpio) in the upper scales of measuring water/emotions as a way of checking how we are doing (Aquarius).
The Taurean romance and Leo rainbow contrast with the more practical Scorpio process of making camp and using the Aquarian hydrometer. But this observations is less relevant that the idea in the cross of the whole being more than the sum of its parts. That is, a settled community arising from two lovers, or a rainbow being more than sunlight and measured raindrops.
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