I see no reason to suspect there is any upper limit, in principle, to the complexity or sophistication of things humans can create. The reason is that we are to

I see no reason to suspect there is any upper limit, in principle, to the complexity or sophistication of things humans can create. The reason is that we are tool users. We create tools, including mathematical and information processing tools that magnify our abilities. These then enable us to create even more powerful tools, which magnify our abilities even more. Rinse, repeat. There doesn't seem to be any obvious reason to me that this has any theoretical limit. Practical limits maybe, but if dumb evolution can crack the AGI problem clearly it's not beyond practical physical limits.