> I would much appreciate it if you could please give a very
> brief verbal description of the ramps you mention here.
These are integral spiral ramps. They'd simply leave the ramp shape carved right into the pyramid and then fill it later.
As ingenious as this is the evidence strongly denies this as any possibility. Such ramps would be even more visible than exterior spiral ramps.
There were no spiral ramps of any sort with the slight possibility of internal spiral ramps but this still waits to be proven. It is unlikely that ramps were the primary means of lifting stones at any levels of the great pyramids with the possible exception of the lowest levels.
Just because 19th century sxcientists couldn't think of any means the ancient Egyptians could build great pyramids without ramps doesn't mean the ancient Egyptians couldn't think of a way to build them without ramps.
The evidence says they used counterweights. I believe that if much effort were expended to investigate this that they'd find that water was used as the ballast. This might even explain why the heiroglyph for pyramid has a red band at the bottom; the damn great pyramids had a red band at the bottom from the bw on down.