I believe you are referring to the series of Minoan frescoes found on the island of Thera, or Santorini, at the Akrotiri settlement. One of the frescoes portrays children boxing and is paired with a fresco depicting antelopes, so they are collectively known as The Antelopes and the Boxing Children, or The Boxing Boys and the Antelopes. This fresco is similar to works from other Mediterranean cultures, most notably, the ancient Egyptians. In contemporary examples from Egypt, we also see individuals portrayed sideways, on a single plane, and without perspective. The sense you get when looking at the fresco is that the boys are frozen in time. Similarly to Egypt, men tended to be painted in shades of brown, while women were painted in lighter shades of off-white. We know that the Minoans and the Egyptians had significant commercial connections, so it is of little surprise that they shared artistic styles, likely learning from and teaching each other.
Comparisons could also be made to works from Mesopotamia and Libya. In fact, some of the other frescos from this settlement seem to narrate a story unfolding in a sub-tropical landscape, and some scholars have posited that this was Libya and that it hints at connections between Minoan and Libyan cultures.
For further reading, I would suggest R.F. Willett’s book, The Civilization of Ancient Crete, Patrick Hunt’s Ten Discoveries That Rewrote History, and Lyvia Morgan’s chapter (“Play, Ritual and Transformation: Sports, Animals and Manhood in Egyptian and Aegean Art”) in the edited volume Ritual, Play, and Belief in Evolution and Early Human Societies, edited by Colin Renfrew, Iain Morley, and Michael Boyd.