the.com/sleekness

The art of looking like you cost more than you did.

means The quality of being smooth, glossy, and polished in form, with nothing jutting, snagging, or out of place.

from From 'sleek,' a variant of 'slick,' both tracing back to Old English/Germanic roots meaning smooth or glossy — the same family that gives us words tied to sliding and gliding. 'Sleek' originally described smooth hair or skin before it slid into describing anything polished enough to catch a compliment.

etymology
Originally described sleek wet otter fur, not laptops
design trick
Removing buttons reads as luxury, even when less useful
physics
Smooth surfaces reduce drag, which is why cheetahs look expensive
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