just look
Note to Economy of Literature, which is a note to Accumulation of Art an addendum to the second lecture from The Political Economy Of Art by John Ruskin

There can be no question, however, of the mischievous tendency of the hurry of the present day, in the way people undertake this very looking. I gave three years' close and incessant labour to the examination of the chronology of the architecture of Venice; two long winters being wholly spent in the drawing of details on the spot: and yet I see constantly that architects who pass three or four days in a gondola going up and down the Grand Canal, think that their first impressions are just as likely to be true as my patiently wrought conclusions. Mr. Street, for instance, glances hastily at the facade of the Ducal Palace—so hastily that he does not even see what its pattern is, and misses the alternation of red and black in the centres of its squares—and yet he instantly ventures on an opinion on the chronology of its capitals, which is one of the most complicated and difficult subjects in the whole range of Gothic archaeology. It may, nevertheless, be ascertained with very fair probability of correctness by any person who will give a month's hard work to it, but it can be ascertained no otherwise.