I've been thinking of snack shapes lately. I remember eating graham crackers, which came as rectangles which you could break cleanly into halves or quarters, thanks to little cuts in the cracker.

I think it would add a handy aesthetic effect if the graham crackers and the breakable peices were in
the Golden Ratio (1:1.618...). Such "Golden Rectangles" are said to be one of the most attractive geometric shapes, and many architects design rooms in such dimensions.

In addition to aesthetic value, the cracker would break into pieces geometrically similar to the original, which might be useful. While you wouldn't be able to split one up equally between two kids, I think many would find such a cracker more "amusing" than the regular ones.

If you want a cracker that splits into two pieces matching the original proportions, the cracker should be cut in the proportion 1:1.414 [i.e. sqrt(2)]. The Golden Mean would be useful if you wanted to break off a SQUARE cracker and have the remaining piece be a clone of the original.

//cut in the proportion 1:1.414 // Correct, looks like the author of this idea is trying to sneak DIN standards into the US. I wonder what Homeland Security thinks about that. Anyway, who would like to buy a DIN A4 Graham Cracker.