Lightening holes

"[The] wisdom of the day was to make everything along the lines of a brick shithouse [...] and then drill holes in the bits to lighten them.

"Lightening holes have been used in various military vehicles, aircraft, equipment and weaponry platforms.

[citation needed] This allows equipment to be lighter in weight as well as increase the ruggedness and durability.

[10] During the 1980s and early 1990s, lightening holes were fashionable and somewhat seen as futuristic and were used in the likes of industrial units, car showrooms, shopping precincts, sports centres etc.

Parsons House in London is a notable building that uses lightening holes since its renovation in 1988.