I've shown these before but they're just so darn photogenic. I came across a stunted oak tree covered in thousands of these galls. Methinks the tiny wasps have been having a party.
Spangle Gall Wasp,
Neuroterus quercusbaccarum.
Nikon D7200
Tokina 100mm f/2.8
f11 1/160 ISO 1250