This is a political design. The use or lack of colour helps extenuate the point the creator wants to create. The use of flowers, as a severe contrast to violence and war, also shows the message of peace, not war. Powerful visuals in a simple way.
Umbrellas, Paradenplatz, Zürich, Switzerland - Members of Swiss trade union Unia hold red umbrellas while forming a large fish apparently swimming after a smaller shark in Zurich. The action was reportedly part of a protest against financial sharks.