The phrase "cylindrical shape" means something that is shaped like a tube or a can - it has a round shape with straight parallel sides. Full definition
Photolithography uses ultra-violet light to remove portions of polydimethylsiloxane (PDMS) substrate to mold it into cylindrical shapes. (sciencedaily.com)
In essence, these patterns and cylindrical shapes with jagged facets, mixing wood - grain tones with pops of bright color just work. (mindbodygreen.com)
It's only partially a coincidence that the base has that same cylindrical shape as the Echo, as this light fixture offers all the same functionality as any Echo smart speaker, but with a light too. (smarthome.reviewed.com)