Yuu Asaka is a Japanese designer known for his unusual 2D packing puzzles.
The Oleo 10 puzzle has four red circular pieces and four black rectangular pieces and you need to fit all ten within the frame.
A little playing around with it and the challenge may seem impossible but stick with it and hopefully you will arrive at the solution.
Oleo 10 is a good introduction to the puzzles of Yuu Asaka and nicely made from laser cut acrylic.
The solution is not provided.
Coming in around the middle in terms of difficulty from Yuu, Oleo 10 has an estimated solve time of 30 minutes.