hi estween! thanks for your ideas. 285 is very attractive. (we binned 284 - please read notes on main page / no need to sumbit multiple versions of same idea). if you want to explore interlocking shapes, we-re looking for three shapes, rather than four. and we're also looking for people to explore other ideas as weve written on the notes of our main page, since so many people are exploring interlocking figures... 283 is missing the subtle clever idea we're looking for.