top view: cell type 01- simpler cell for proliferation
top view: introduction of cell type 02
top view: inner tubesas connector
side view: inner tube connecting two cell types
connectivity option 01: single strand
connectivity option 02: multiple strands
connectivity option 02 detail - ideally would be thinner, more threadbarebut could have structural role - also, could wrap around inner tubes - this "organ" or more complex group of cells may eventually inhabit the openings of earlier cells or grow off of a different group of cells, etc.