Okay, okay, I give up, I've been staring and staring at this picture and trying to figure out what I'm looking at, I've got 2 ideas...
1. You live in a bad earthquake area (or on the back of the largest trailer garage I've ever seen) and the garage shakes a lot and so you have to tie your bike down like it's in a trailer. ???
2. Your box on the back weighs SOOOO much that the kickstand will not hold it up because it's center of gravity is too high so you put the block of wood under it, but the block is too big and will knock the bike over on the other side so you tied a strap to the wall to keep it from going over?
so maybe you just tell us why the bike is tied to the wall with a block of wood under the kickstand, please? Maybe it's just easier to work on the bike when it's straight up and down?
Actually, when I took this pic, I was doing some other maintenance on the bike, wanted it level, and was too lazy to put it on the stand.