They created an Optical Illusion.
The way we see object in a specific area differs significantly depending on our distance and point of view when we see it.
To counteract it ( for example if they want the building to look nice in the picture), many architects create an optical Illusion and it will negate the effect of the distorsion
assuming efficiency of each man to dig trench, in one day, for one hour is constant,

so one man, working for one hour in one day can dig 1.5 m
so 8 men, working 3 hours a day and will take, say $d$ number of days and efficiency will be constant. so,
$\frac32=\frac{220}{8\times3\times d}$
$\implies d=\frac{55}9=6.12$
Answer:
it refers to all the broken glass on the floor left their by the nazi people after attacking jewish property
Explanation:
they broke the glass and knocked down the doors to all of their stores and homes to influnce fear during the begging of the holocaust
Answer:
because it flooded every year