The zone is 8a, Central Europe. The photo is taken mid-May.
The back side is little purplish:
Helicopters:
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Maybe *Acer opalus* – Giacomo Catenazzi May 14 '18 at 07:45
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What part of the world? – kevinskio May 14 '18 at 10:06
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Central Europe. @kevinsky – VividD May 14 '18 at 10:08
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Judging from the leaf (second picture), my guess is [*Acer pseudoplatanus*](https://landscapeplants.oregonstate.edu/plants/acer-pseudoplatanus). Can't see the trunk and bark very good. – benn May 14 '18 at 13:12