"It's a warm wind, the west wind, full of birds' cries; I never hear the west wind but tears are in my eyes. For it comes from the west lands, the old brown hills, And April's in the West wind, and daffodils."

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The immaterial blue colour shown at Iris Clert's in April had in short made me inhuman, had excluded me from the world of tangible reality; I was an extreme element of society who lived in space and who had no means of coming back to earth. Jean Tinguely saw me in space and signaled to me in speed to show me the last machine to take to return to the ephemerality of material life.

— Yves Klein