Long live design principles!

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Yes, it’s a pen.

Photo by the author


Photo by Camille / Kmile on Unsplash


Pick your worst user to design more efficient interfaces.

Photo by Casey Horner on Unsplash


A definition of product


We are surrounded by objects that have history, that span centuries — and sometimes we completely ignore it.


There’s no logical reason why telephones and calculators use different numeric keypads. So why do we still follow the same convention?



How bottom-up product design liberates designers and delights users.

Francesco Bertelli

Design Director @ Work & Co, Brooklyn

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