Thank you for posting these amazing designs! As an architect it would be cool if you could list the architects or designers of these projects. Also just an FYI many of these would not meet code but might be okay for a second exit as long as there is a code compliant stair in addition. An architect can assist in determining if a particular design will comply.

I concur on the psychadelic one giving a migraine and it could be dangerous for some in that it is difficult to discern the tread nosings. What helps is that the pattern runs perpendiculkar where the handrails are, though this appears to be a commercial application and most officials might require more regularly spaced handrails unless the designer was able to argue that the bulk of the stair is seating.

Thanks again for posting!