https://en.wikipedia.org/wiki/Menger_sponge#/media/File:Cmglee_Cambridge_Science_Festival_2015_Menger_sponge.jpg

and what else, dazzlenation?...well, it looks like 'little colin' in there, doesn't it?....LOL...see previous post...go figure:

 

https://mary2point5.tumblr.com/

 

M4, anybody?

....looks a bit like 'sand', that small....hmmm...perhaps we have a rimington/sphinx number, going on - here?...additionally, remember toddy's old house in Lewisham/Blackheath?...a bit of a 'sandpit' too....go figure: