@NewThinking2, This got built in my living room during lego time last night. Reminded me of the RiverArch project. I’ll ask the kiddos how they did it.
Colour symmetry too, a true sign of a master builder
The blocks seem to be mimicking the rug pattern as well
The bottom one looks more reasonable as its shape somewhat resembles a parabola. A perfect arc is not an efficient way to carry the loads.
Not so surprising. If you look closely, the rug is made of lego,