A dinoszaurusztól az űrhajóig — megérteti a múltat és a jelent a 25 éves Élet és Tudomány
(From dinosaurs to spaceships — understanding the past and the significance of 25 years of Life and Science journal)
In this Hungarian poster, the various acute accents including the double acute in Ű (also known as Hungarumlaut) have all been reduced to flat macron-like lines. This modernist approach is in line with the simplistic construction of Marvin, and enables a compact setting with tight linespacing.
To quote David Jonathan Ross from his recent presentation at ATypI Montréal:
90% of the importance of a diacritic is just to see something there
This is certainly true in display typography where maximizing the graphic impact outweighs any issues related to ambiguity.