a couple of posts on bread #476 got me thinking. they were:

>>387418 (in referring to Q's >>386861) which said:

15Map 10 5 (1)key

60dSkeystone

1971!!!!!!!

The top isn't so complicated. Everything that goes into it is. Should I make it easy for them Q?

then >>387505 (in referring to Q's >>387462) which said:

60dS=c

a a a a a b b b b b b b b b c

then same anon posted >>387536 (in referring to their own previous post 387505) which said:

where is up down

where is left right

where you find the keystone

then finally they posted >>387617 which said:

The map is in plain sight. Don't make it so complicated. It doesn't have most of the answers you want. The map tells you where to dig.

i then started thinking about bridges with keystones in them. if the keystone is at the top and all of the strikers come down in an arch from the keystone, and if the bridge is over water, then the arch would be reflected in the water. so i used the above a a a a a b b b b b b b b b c where c would be the keystone and the other letters the strikers beside forming the rest of the arch. i then thought of using the "up down, left right" post to form the other letters which i reflected with a mirror. i came up with the following rough sketch. maybe you smarter anons could figure something to do with it?? maybe it could form some kind of legend for a map??