These are a pair of Player Invention card trays for the board game Inventions - Evolution of Ideas. During the game a player earns Invention cards, which go to the right of their Society board. These cards can become rather disorganized as they accumulate.

The trays shared here take up about the width of a sleeved card and can hold five cards each in each of the three Progress categories. There are two versions of the tray, depending on display preference:

Tray A: The Invention Cards go in the slots name-side first so that the available Chain Action symbol is prominently displayed.

Tray B: The Invention Cards go in with the name up top so that the Progress color band and Era icon are prominently displayed. The Chain Action symbol is still visible, but is a bit hidden in the Technology and Economy columns as cards accumulate since the symbol is lower down with this card orientation.

I thought that my preference would be Tray A, but after printing out one of each I found that I liked the visual aesthetic of Tray B better. See the accompanying photos to compare. When playing, I start filling the Economy column from the top and the Technology and Culture columns from the bottom to maximize card visibility.

The trays are designed to fit in the box on top of the plastic lid, on either side of the game board. The angled portions of the trays rest against the angled protrusions of the plastic lid.