The collectible phone card presents a visually captivating design that intricately combines cultural heritage with a modern utilitarian object. Dominating the right side of the card is a vivid depiction of the Aztec Calendar, also known as the Piedra del Sol or Sun Stone. This ancient artifact is intricately illustrated with vibrant colors and detailed patterns, highlighting the rich artistic legacy of the Aztecs. The calendar's concentric circles are filled with complex symbols and figures, representing the Aztec understanding of the cosmos and time. These meticulously rendered details add a layer of historical significance to the card, making it not only a communication tool but also a tribute to cultural history.

On the left side of the card, the background is a bright yellow with erratic wave-like designs in lighter hues, evoking a sense of warmth and energy. Overlaying this vibrant background is a bold, dark blue rectangle that sharply contrasts with the yellow. Within this rectangle, the text "Piedra del Quinto Sol" and "Calendario Azteca" is printed in an elegant white font, clearly standing out against the blue. The lettering not only identifies the cultural motif of the phone card but also bestows an air of sophistication and respect for the content it carries. This textual element further enhances the card's thematic focus on the Aztec civilization and its enduring legacy.

Beneath the rectangle, on the left corner, is the denomination of the card: "125 unidades" in large, bold, red-orange numerals and letters. This indicator of the card's worth is both a functional and aesthetic element. Its placement at the bottom left ensures it is easily visible while not overpowering the card's artistic embellishments. The choice of color harmonizes with the yellow-orange theme and maintains the card's sense of symmetry and balance between form and function.

At the top left, a small logo featuring a stylized depiction of "PIT" sits unobtrusively, subtly marking the corporate identity without detracting from the overall aesthetic experience. The card effectively merges traditional motifs with the modern needs of a phone card, creating a unique collectible that appeals to both art enthusiasts and those with an appreciation for historical culture. Its design is not only a decorative piece; it is a connection to a profound past, encapsulated in a small, everyday item.