I used a pen by @prisoner849 and changed spheres to boxes. Now I want all the instanced boxes lookat sphere´s position - can somenone tell me how:
Quick search for lookAt in glsl gave some links to resources, I used one of them 
Picture:
Ace!
Can I add a “per box scale factor” to this as well? So that each box has a different z-size/height?
Yes, add another one instanced buffer attribute, for example.
I modified the codepen from my post above.
This is awesome!
Is there a way to update colors of the instancedmeshes in the renderloop?
Nothing can stop you from changing and updating of buffer attributes, including the one with colors
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